Imported Upstream version 6.10.0.49

Former-commit-id: 1d6753294b2993e1fbf92de9366bb9544db4189b

external/llvm-project/openmp/offload/src/rdtsc.h

@@ -0,0 +1,17 @@
+//===----------------------------------------------------------------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is dual licensed under the MIT and the University of Illinois Open
+// Source Licenses. See LICENSE.txt for details.
+//
+//===----------------------------------------------------------------------===//
+
+#include <stdint.h>
+
+uint64_t _rdtsc()
+{
+  uint32_t eax, edx;
+  asm volatile ("rdtsc" : "=a" (eax), "=d" (edx));
+  return ((uint64_t)edx << 32) | eax;
+}