Move FxAA jobs to Win2k8, Clang, GCE, 64-bit; run fewer configs.

These jobs were originally added in
https://skia-review.googlesource.com/c/skia/+/60540.

No-Try: true
Change-Id: I38677933dbb05dac8df9ea236af9a5d7b8227623
Reviewed-on: https://skia-review.googlesource.com/63742
Commit-Queue: Ben Wagner <benjaminwagner@google.com>
Reviewed-by: Yuqian Li <liyuqian@google.com>
9 files changed