F32ReinterpretI32 and I32ReinterpretF32 tests don't actually have
floating point values involved during testing and only use
integers.

This CL adds FP values as well as fixes the test names to match
their operation.

Change-Id: I321a7f7af8ae93f6eae4fa263f8e8d0b7bf4d672
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3078381Reviewed-by: Zhi An Ng <zhin@chromium.org>
Commit-Queue: Milad Fa <mfarazma@redhat.com>
Cr-Commit-Position: refs/heads/master@{#76181}