This CL removes some magic numbers used to convert floating values into
integer values, and the corresponding comments describing how they were
computed. It replaces these tests with template function is_inbounds()
that makes the compiler automatically generate the appropriate constants
and tests.

Note: This CL only changes the WASM interpreter to use is_inbounds(). Tests
have not yet been updated to guarantee that this change did not break anything.

Note: This change was initialed by a comment by @clemensh in
CL https://chromium-review.googlesource.com/c/v8/v8/+/834670.

Bug: v8:7226
Change-Id: I14c0962eb6ae20cf6647787c006924a208f7ce4a
Reviewed-on: https://chromium-review.googlesource.com/846280
Commit-Queue: Karl Schimpf <kschimpf@chromium.org>
Reviewed-by: Clemens Hammacher <clemensh@chromium.org>
Cr-Commit-Position: refs/heads/master@{#50383}