Roll clang for Windows to chromium's current.

This is mostly to pick up new warnings before chromium complains about
them.

Change-Id: I69a0c3da63398f98d3f45b0993ed3325c0edae27
Reviewed-on: https://skia-review.googlesource.com/127395
Reviewed-by: Ben Wagner <benjaminwagner@google.com>
Commit-Queue: Ben Wagner <benjaminwagner@google.com>
4 files changed