We use a hash for different things:
- dumping wasm module to file,
- generating the script name, and
- computing prefix hash / wire byte hash for caching.

Two of them were using the StringHasher, one use base::hash_range.
For experimental PGO support, we will also need a hash value, so unify
this to use the same hash everywhere.
Since the result of base::hash_range is platform-dependent, use the
StringHasher everywhere.

R=thibaudm@chromium.org

Bug: v8:13209
Change-Id: Iae8c2385264ecedd4daea16d7f9221bc94650eef
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3855310Reviewed-by: Thibaud Michaud <thibaudm@chromium.org>
Commit-Queue: Clemens Backes <clemensb@chromium.org>
Cr-Commit-Position: refs/heads/main@{#82766}