Add __hip_pinned_shadow__ for hip-clang and fix texture reference tests (#1200)

[ROCm/clr commit: 3169f3a881]

projects/clr/hipamd/tests/src/texture/hipBindTexRef1DFetch.cpp

@@ -32,6 +32,9 @@ THE SOFTWARE.
 
 #define N 512
 
+#if __HIP__
+__hip_pinned_shadow__
+#endif
 texture<float, 1, hipReadModeElementType> tex;
 
 __global__ void kernel(float *out) {