Fix and enable warning C4244 (Conversion from 'type1' to 'type2', possible loss of data)

Change-Id: Id0e06d7d6600344d858f00dabc219d79289bbc82
Reviewed-on: https://chromium-review.googlesource.com/265020
Tested-by: Minmin Gong <mgong@microsoft.com>
Reviewed-by: Jamie Madill <jmadill@chromium.org>
Reviewed-by: Geoff Lang <geofflang@chromium.org>
diff --git a/src/compiler/preprocessor/ExpressionParser.cpp b/src/compiler/preprocessor/ExpressionParser.cpp
index 616f4d7..4a90322 100644
--- a/src/compiler/preprocessor/ExpressionParser.cpp
+++ b/src/compiler/preprocessor/ExpressionParser.cpp
@@ -86,7 +86,7 @@
 #pragma GCC diagnostic ignored "-Wuninitialized"
 #endif
 #elif defined(_MSC_VER)
-#pragma warning(disable: 4065 4701 4702)
+#pragma warning(disable: 4065 4244 4701 4702)
 #endif
 
 #include "ExpressionParser.h"