Imported Upstream version 6.10.0.49

Former-commit-id: 1d6753294b2993e1fbf92de9366bb9544db4189b

external/llvm-project/compiler-rt/test/msan/test.h

@@ -0,0 +1,15 @@
+#if __LP64__
+# define SANITIZER_WORDSIZE 64
+#else
+# define SANITIZER_WORDSIZE 32
+#endif
+
+// This is a simplified version of GetMaxVirtualAddress function.
+unsigned long SystemVMA () {
+#if SANITIZER_WORDSIZE == 64
+  unsigned long vma = (unsigned long)__builtin_frame_address(0);
+  return SANITIZER_WORDSIZE - __builtin_clzll(vma);
+#else
+  return SANITIZER_WORDSIZE;
+#endif
+}