Disable MSVC warning about runtime stack overflow for DebugOverflowStack.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@132059 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Lex/Pragma.cpp b/lib/Lex/Pragma.cpp
index ecbf4cf..23855d4 100644
--- a/lib/Lex/Pragma.cpp
+++ b/lib/Lex/Pragma.cpp
@@ -824,9 +824,17 @@
     }
   }
 
+// Disable MSVC warning about runtime stack overflow.
+#ifdef _MSC_VER
+    #pragma warning(disable : 4717)
+#endif
   void DebugOverflowStack() {
     DebugOverflowStack();
   }
+#ifdef _MSC_VER
+    #pragma warning(default : 4717)
+#endif
+
 };
 
 /// PragmaDiagnosticHandler - e.g. '#pragma GCC diagnostic ignored "-Wformat"'