Imported Upstream version 6.10.0.49

Former-commit-id: 1d6753294b2993e1fbf92de9366bb9544db4189b

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

@@ -0,0 +1,18 @@
+// RUN: %clangxx_msan -O0 -g %s -o %t && %run %t
+// RUN: %clangxx_msan -O0 -g -DUNINIT %s -o %t && not %run %t 2>&1 | FileCheck %s
+
+#include <assert.h>
+#include <stdio.h>
+#include <stdlib.h>
+
+int main(void) {
+  unsigned seed;
+#ifndef UNINIT
+  seed = 42;
+#endif
+  int v = rand_r(&seed);
+  // CHECK: MemorySanitizer: use-of-uninitialized-value
+  // CHECK: in main{{.*}}rand_r.cc:[[@LINE-2]]
+  if (v) printf(".\n");
+  return 0;
+}