Reland "Enable sizeof-array-div warning"

This reverts commit 6be24baec4.

Reason for revert: warnings fixed in source files

Change-Id: I223ff6343c41ac957485726a3de006a84b9369df

cc/config/global.go

@@ -222,7 +222,6 @@ var (
 		// http://b/145211066
 		"-Wno-implicit-int-float-conversion",
 		// New warnings to be fixed after clang-r377782.
-		"-Wno-sizeof-array-div",             // http://b/148815709
 		"-Wno-tautological-overlap-compare", // http://b/148815696
 		// New warnings to be fixed after clang-r383902.
 		"-Wno-deprecated-copy",                      // http://b/153746672
@@ -245,6 +244,8 @@ var (
 	}
 
 	noOverrideExternalGlobalCflags = []string{
+		// http://b/148815709
+		"-Wno-sizeof-array-div",
 		// http://b/197240255
 		"-Wno-unused-but-set-variable",
 		"-Wno-unused-but-set-parameter",