[msan] Change report header to be more alike to ASan and TSan.

llvm-svn: 182774
diff --git a/compiler-rt/lib/msan/msan_report.cc b/compiler-rt/lib/msan/msan_report.cc
index 734fc96..1212e9c 100644
--- a/compiler-rt/lib/msan/msan_report.cc
+++ b/compiler-rt/lib/msan/msan_report.cc
@@ -94,7 +94,7 @@
 
   Decorator d;
   Printf("%s", d.Warning());
-  Report(" WARNING: Use of uninitialized value\n");
+  Report(" WARNING: MemorySanitizer: use-of-uninitialized-value\n");
   Printf("%s", d.End());
   PrintStack(stack->trace, stack->size);
   if (origin) {