Clean up 669-moveable-string-class-equals.

This is a follow-up addressing late comments on
    https://android-review.googlesource.com/531015 .

The --no-dex2oat in unnecessary since
    https://android-review.googlesource.com/531270 .

Test: 669-moveable-string-class-equals (--jit)
Bug: 68181300
Change-Id: Ia978a1cacec7a3aec78e4c132d78c0031f3f5cd9
2 files changed