Pass #pragma optimize setting down to compilation. This will allow us to disable optimizations in the back-end. This can be useful both for developers and for ANGLE to disable very slow shader compilation on D3D11. Also apply this pragma to VerifyMaxVertexUniformVectorsWithSamplers. Reduces compilation time by half in local testing. Bug: angleproject:5076 Change-Id: I64ad576e11b9cee5b41f8af0d3621570304d65c2 Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/2420749 Commit-Queue: Jamie Madill <jmadill@chromium.org> Reviewed-by: Jonah Ryan-Davis <jonahr@google.com> Reviewed-by: Geoff Lang <geofflang@chromium.org>