back to individual flags for :hsw

We still have some bots that use GCC 4.8 that don't understand
-march=haswell.  I hope to fix that, then revert this.

Change-Id: I8ba99d7170d00945e07da33b893a63981b64f5ca
Reviewed-on: https://skia-review.googlesource.com/115761
Reviewed-by: Mike Klein <mtklein@chromium.org>
Commit-Queue: Mike Klein <mtklein@chromium.org>
1 file changed