This only changes iterator type specifiers and cast expressions.

See
https://clang.llvm.org/extra/clang-tidy/checks/modernize-use-auto.html
for more on this warning.

Bug: v8:10488
Change-Id: I1e6747aafb24fd2d9d946e054fb20fbd1d8e5b26
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2191921Reviewed-by: Bill Budge <bbudge@chromium.org>
Commit-Queue: Zhi An Ng <zhin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#67814}