unsigned is (uint32_t) in both branches, so the cast can be removed.

See
https://clang.llvm.org/extra/clang-tidy/checks/google-readability-casting.html
and https://google.github.io/styleguide/cppguide.html#Casting.

Bug: v8:10488
Change-Id: I6d669e36509049fde449d8455c34d140f95b9b8b
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2233989
Commit-Queue: Zhi An Ng <zhin@chromium.org>
Reviewed-by: Jakob Kummerow <jkummerow@chromium.org>
Cr-Commit-Position: refs/heads/master@{#68303}