Add compiler configuration to calmbench bots

Now the calmbench bot has the same name schema as the build bots
and we're testing using Clang instead of GCC. In the future, we
may also import some configuration schemas from perf bots.

Bug: skia:
Change-Id: Idd9556cff36b749a6c9139d34f70ac50ca48fbba
Reviewed-on: https://skia-review.googlesource.com/62920
Reviewed-by: Eric Boren <borenet@google.com>
Commit-Queue: Yuqian Li <liyuqian@google.com>
7 files changed