Hack to suppress warnings from MSL compiler

Change-Id: I43ca73d208334c71b393a4b6352b758c8c45ce27
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/538045
Commit-Queue: Brian Osman <brianosman@google.com>
Reviewed-by: Greg Daniel <egdaniel@google.com>
1 file changed