hook up float comparisons to x86 JIT

This gets the draws in gm/skvm.cpp all JITing again,
and in one of the unit tests.

(Everything draws the same of course.)

Change-Id: Iada28690d9df78f9d444ee3765e21beb29239672
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/253166
Auto-Submit: Mike Klein <mtklein@google.com>
Reviewed-by: Mike Klein <mtklein@google.com>
Commit-Queue: Mike Klein <mtklein@google.com>
2 files changed