Imported Upstream version 6.10.0.49

Former-commit-id: 1d6753294b2993e1fbf92de9366bb9544db4189b

external/llvm-project/compiler-rt/test/msan/memcmp_test.cc

@@ -0,0 +1,18 @@
+// RUN: %clangxx_msan -O0 -g %s -o %t
+// RUN: not %run %t 2>&1 | FileCheck %s
+// RUN: MSAN_OPTIONS=intercept_memcmp=0 %run %t
+
+#include <string.h>
+#include <stdio.h>
+int main(int argc, char **argv) {
+  char a1[4];
+  char a2[4];
+  for (int i = 0; i < argc * 3; i++)
+    a2[i] = a1[i] = i;
+  int res = memcmp(a1, a2, 4);
+  if (!res)
+    printf("equals");
+  return 0;
+  // CHECK: Uninitialized bytes in __interceptor_memcmp at offset 3
+  // CHECK: MemorySanitizer: use-of-uninitialized-value
+}