Silence a VS warning.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@19377 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Support/Timer.cpp b/lib/Support/Timer.cpp
index 4b273b0..38a8b44 100644
--- a/lib/Support/Timer.cpp
+++ b/lib/Support/Timer.cpp
@@ -95,7 +95,7 @@
 
 static inline long getMemUsage() {
   if (TrackSpace)
-    return sys::Process::GetMallocUsage();
+    return (long)sys::Process::GetMallocUsage();
   return 0;
 }