Update intrinsic tests to floor(vec) and ceil(vec).
Update intrinsic tests to floor(vec) and ceil(vec).

This might help us narrow down misbehavior on older Intel GPUs when
running on ANGLE + DX9.

Change-Id: I32bfb1e5cfbaa6a8b8c1e197b806073a4cd717bc
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/362416
Commit-Queue: John Stiles <f4fcf42d3bb5924557f1eeb3be66747535e585da@google.com>
Commit-Queue: Ethan Nicholas <d2cfb8c2f603266f4dc3a6f09acbcc0089603b37@google.com>
Reviewed-by: Ethan Nicholas <d2cfb8c2f603266f4dc3a6f09acbcc0089603b37@google.com>
Auto-Submit: John Stiles <f4fcf42d3bb5924557f1eeb3be66747535e585da@google.com>

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