Expose the CUDA shared attribute to the C API.

Similar to r209767, which exposed other CUDA-related attributes.

Patch by Rob Springer.

llvm-svn: 215208
diff --git a/clang/test/Index/attributes-cuda.cu b/clang/test/Index/attributes-cuda.cu
index 953ef3d..824bdb4 100644
--- a/clang/test/Index/attributes-cuda.cu
+++ b/clang/test/Index/attributes-cuda.cu
@@ -3,6 +3,7 @@
 __attribute__((device)) void f_device();
 __attribute__((global)) void f_global();
 __attribute__((constant)) int* g_constant;
+__attribute__((shared)) float *g_shared;
 __attribute__((host)) void f_host();
 
 // CHECK:       attributes-cuda.cu:3:30: FunctionDecl=f_device:3:30
@@ -11,5 +12,7 @@
 // CHECK-NEXT:  attributes-cuda.cu:4:16: attribute(global)
 // CHECK:       attributes-cuda.cu:5:32: VarDecl=g_constant:5:32 (Definition)
 // CHECK-NEXT:  attributes-cuda.cu:5:16: attribute(constant)
-// CHECK:       attributes-cuda.cu:6:28: FunctionDecl=f_host:6:28
-// CHECK-NEXT:  attributes-cuda.cu:6:16: attribute(host)
+// CHECK:       attributes-cuda.cu:6:32: VarDecl=g_shared:6:32 (Definition)
+// CHECK-NEXT:  attributes-cuda.cu:6:16: attribute(shared)
+// CHECK:       attributes-cuda.cu:7:28: FunctionDecl=f_host:7:28
+// CHECK-NEXT:  attributes-cuda.cu:7:16: attribute(host)