[wasm simd] Refactor tests to check results in C++ code.

- Converts most integer vector tests to use globals (except Select)
  so results can be checked in C++ code.
- Remove integer vector result checking macros.
- Add specializations of test CompareOps for floats, so we can use
  BinOps for integer vector compare opcodes.
- Remove Run#format#CompareOpTests helper functions for integer vector
  types. Use Run#BinOpTests helper function instead.

Bug: v8:6020
Change-Id: I968a71c874b028a750e1118cf51f6678cae90091
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1496281
Commit-Queue: Bill Budge <bbudge@chromium.org>
Reviewed-by: Deepti Gandluri <gdeepti@chromium.org>
Cr-Commit-Position: refs/heads/master@{#60111}