Add Win x86 Clang Perf/Test jobs.

Also switch CQ Win 32-bit Build from MSVC to Clang.

No-Try: true
Change-Id: Ic312ee611b1e99143480840c08a9266a4d8b448b
Reviewed-on: https://skia-review.googlesource.com/113672
Commit-Queue: Ben Wagner <benjaminwagner@google.com>
Reviewed-by: Mike Klein <mtklein@google.com>
3 files changed