[sanitizers] Enable memory sanitizer on clang

This patch enables MSan for aarch64/linux

llvm-svn: 247808
diff --git a/clang/lib/Driver/ToolChains.cpp b/clang/lib/Driver/ToolChains.cpp
index 7f0b9bb..1569872 100644
--- a/clang/lib/Driver/ToolChains.cpp
+++ b/clang/lib/Driver/ToolChains.cpp
@@ -3761,7 +3761,7 @@
     Res |= SanitizerKind::Leak;
   if (IsX86_64 || IsMIPS64 || IsAArch64)
     Res |= SanitizerKind::Thread;
-  if (IsX86_64 || IsMIPS64 || IsPowerPC64)
+  if (IsX86_64 || IsMIPS64 || IsPowerPC64 || IsAArch64)
     Res |= SanitizerKind::Memory;
   if (IsX86 || IsX86_64) {
     Res |= SanitizerKind::Function;