Revert "Revert "Upgrade to 5.0.71.48"" DO NOT MERGE

This reverts commit f2e3994fa5148cc3d9946666f0b0596290192b0e,
and updates the x64 makefile properly so it doesn't break that
build.

FPIIM-449

Change-Id: Ib83e35bfbae6af627451c926a9650ec57c045605
(cherry picked from commit 109988c7ccb6f3fd1a58574fa3dfb88beaef6632)
diff --git a/third_party/llvm-build/Release+Asserts/lib/clang/3.9.0/include/__clang_cuda_cmath.h b/third_party/llvm-build/Release+Asserts/lib/clang/3.9.0/include/__clang_cuda_cmath.h
new file mode 100644
index 0000000..ae7ff2f
--- /dev/null
+++ b/third_party/llvm-build/Release+Asserts/lib/clang/3.9.0/include/__clang_cuda_cmath.h
@@ -0,0 +1,148 @@
+/*===---- __clang_cuda_cmath.h - Device-side CUDA cmath support ------------===
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ *
+ *===-----------------------------------------------------------------------===
+ */
+#ifndef __CLANG_CUDA_CMATH_H__
+#define __CLANG_CUDA_CMATH_H__
+#ifndef __CUDA__
+#error "This file is for CUDA compilation only."
+#endif
+
+// CUDA lets us use various std math functions on the device side.  This file
+// works in concert with __clang_cuda_math_forward_declares.h to make this work.
+//
+// Specifically, the forward-declares header declares __device__ overloads for
+// these functions in the global namespace, then pulls them into namespace std
+// with 'using' statements.  Then this file implements those functions, after
+// the implementations have been pulled in.
+//
+// It's important that we declare the functions in the global namespace and pull
+// them into namespace std with using statements, as opposed to simply declaring
+// these functions in namespace std, because our device functions need to
+// overload the standard library functions, which may be declared in the global
+// namespace or in std, depending on the degree of conformance of the stdlib
+// implementation.  Declaring in the global namespace and pulling into namespace
+// std covers all of the known knowns.
+
+#define __DEVICE__ static __device__ __inline__ __attribute__((always_inline))
+
+__DEVICE__ long long abs(long long __n) { return ::llabs(__n); }
+__DEVICE__ long abs(long __n) { return ::labs(__n); }
+__DEVICE__ float abs(float __x) { return ::fabsf(__x); }
+__DEVICE__ double abs(double __x) { return ::fabs(__x); }
+__DEVICE__ float acos(float __x) { return ::acosf(__x); }
+__DEVICE__ float asin(float __x) { return ::asinf(__x); }
+__DEVICE__ float atan(float __x) { return ::atanf(__x); }
+__DEVICE__ float atan2(float __x, float __y) { return ::atan2f(__x, __y); }
+__DEVICE__ float ceil(float __x) { return ::ceilf(__x); }
+__DEVICE__ float cos(float __x) { return ::cosf(__x); }
+__DEVICE__ float cosh(float __x) { return ::coshf(__x); }
+__DEVICE__ float exp(float __x) { return ::expf(__x); }
+__DEVICE__ float fabs(float __x) { return ::fabsf(__x); }
+__DEVICE__ float floor(float __x) { return ::floorf(__x); }
+__DEVICE__ float fmod(float __x, float __y) { return ::fmodf(__x, __y); }
+__DEVICE__ int fpclassify(float __x) {
+  return __builtin_fpclassify(FP_NAN, FP_INFINITE, FP_NORMAL, FP_SUBNORMAL,
+                              FP_ZERO, __x);
+}
+__DEVICE__ int fpclassify(double __x) {
+  return __builtin_fpclassify(FP_NAN, FP_INFINITE, FP_NORMAL, FP_SUBNORMAL,
+                              FP_ZERO, __x);
+}
+__DEVICE__ float frexp(float __arg, int *__exp) {
+  return ::frexpf(__arg, __exp);
+}
+__DEVICE__ bool isinf(float __x) { return ::__isinff(__x); }
+__DEVICE__ bool isinf(double __x) { return ::__isinf(__x); }
+__DEVICE__ bool isfinite(float __x) { return ::__finitef(__x); }
+__DEVICE__ bool isfinite(double __x) { return ::__finite(__x); }
+__DEVICE__ bool isgreater(float __x, float __y) {
+  return __builtin_isgreater(__x, __y);
+}
+__DEVICE__ bool isgreater(double __x, double __y) {
+  return __builtin_isgreater(__x, __y);
+}
+__DEVICE__ bool isgreaterequal(float __x, float __y) {
+  return __builtin_isgreaterequal(__x, __y);
+}
+__DEVICE__ bool isgreaterequal(double __x, double __y) {
+  return __builtin_isgreaterequal(__x, __y);
+}
+__DEVICE__ bool isless(float __x, float __y) {
+  return __builtin_isless(__x, __y);
+}
+__DEVICE__ bool isless(double __x, double __y) {
+  return __builtin_isless(__x, __y);
+}
+__DEVICE__ bool islessequal(float __x, float __y) {
+  return __builtin_islessequal(__x, __y);
+}
+__DEVICE__ bool islessequal(double __x, double __y) {
+  return __builtin_islessequal(__x, __y);
+}
+__DEVICE__ bool islessgreater(float __x, float __y) {
+  return __builtin_islessgreater(__x, __y);
+}
+__DEVICE__ bool islessgreater(double __x, double __y) {
+  return __builtin_islessgreater(__x, __y);
+}
+__DEVICE__ bool isnan(float __x) { return ::__isnanf(__x); }
+__DEVICE__ bool isnan(double __x) { return ::__isnan(__x); }
+__DEVICE__ bool isnormal(float __x) { return __builtin_isnormal(__x); }
+__DEVICE__ bool isnormal(double __x) { return __builtin_isnormal(__x); }
+__DEVICE__ bool isunordered(float __x, float __y) {
+  return __builtin_isunordered(__x, __y);
+}
+__DEVICE__ bool isunordered(double __x, double __y) {
+  return __builtin_isunordered(__x, __y);
+}
+__DEVICE__ float ldexp(float __arg, int __exp) {
+  return ::ldexpf(__arg, __exp);
+}
+__DEVICE__ float log(float __x) { return ::logf(__x); }
+__DEVICE__ float log10(float __x) { return ::log10f(__x); }
+__DEVICE__ float modf(float __x, float *__iptr) { return ::modff(__x, __iptr); }
+__DEVICE__ float nexttoward(float __from, float __to) {
+  return __builtin_nexttowardf(__from, __to);
+}
+__DEVICE__ double nexttoward(double __from, double __to) {
+  return __builtin_nexttoward(__from, __to);
+}
+__DEVICE__ float pow(float __base, float __exp) {
+  return ::powf(__base, __exp);
+}
+__DEVICE__ float pow(float __base, int __iexp) {
+  return ::powif(__base, __iexp);
+}
+__DEVICE__ double pow(double __base, int __iexp) {
+  return ::powi(__base, __iexp);
+}
+__DEVICE__ bool signbit(float __x) { return ::__signbitf(__x); }
+__DEVICE__ bool signbit(double __x) { return ::__signbit(__x); }
+__DEVICE__ float sin(float __x) { return ::sinf(__x); }
+__DEVICE__ float sinh(float __x) { return ::sinhf(__x); }
+__DEVICE__ float sqrt(float __x) { return ::sqrtf(__x); }
+__DEVICE__ float tan(float __x) { return ::tanf(__x); }
+__DEVICE__ float tanh(float __x) { return ::tanhf(__x); }
+
+#undef __DEVICE__
+
+#endif