Quash a whole bunch of warnings

llvm-svn: 145624
Cr-Mirrored-From: sso://chromium.googlesource.com/_direct/external/github.com/llvm/llvm-project
Cr-Mirrored-Commit: c206366fd7774aff222578c2680b931a4c2c35ba
diff --git a/include/cmath b/include/cmath
index ab67112..f0b985c 100644
--- a/include/cmath
+++ b/include/cmath
@@ -1600,7 +1600,7 @@
 using ::asinhl;
 using ::atanhl;
 using ::cbrtl;
-#endif !_MSC_VER
+#endif  // !_MSC_VER
 using ::copysignl;
 #ifndef _MSC_VER
 using ::erfl;