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/lib/linux/libclang_rt.tsan_cxx-x86_64.a.syms b/third_party/llvm-build/Release+Asserts/lib/clang/3.9.0/lib/linux/libclang_rt.tsan_cxx-x86_64.a.syms
new file mode 100644
index 0000000..4d7f9d7
--- /dev/null
+++ b/third_party/llvm-build/Release+Asserts/lib/clang/3.9.0/lib/linux/libclang_rt.tsan_cxx-x86_64.a.syms
@@ -0,0 +1,25 @@
+{
+  Annotate*;
+  RunningOnValgrind;
+  ValgrindSlowdown;
+  WTFAnnotate*;
+  _ZdaPv;
+  _ZdaPvRKSt9nothrow_t;
+  _ZdlPv;
+  _ZdlPvRKSt9nothrow_t;
+  _Znam;
+  _ZnamRKSt9nothrow_t;
+  _Znwm;
+  _ZnwmRKSt9nothrow_t;
+  __tsan_acquire;
+  __tsan_atomic*;
+  __tsan_func*;
+  __tsan_init;
+  __tsan_java*;
+  __tsan_read*;
+  __tsan_release;
+  __tsan_unaligned*;
+  __tsan_vptr*;
+  __tsan_write*;
+  __ubsan_*;
+};