Make the block defining the counter names more organized, and mostly
clang-formatted.
This slightly changes the name of the CODE_TYPE and FIXED_ARRAY
counters ('-' -> '_'), but none of them are used in chrome or in
benchmarks, so this should be fine.

R=mlippautz@chromium.org

Bug: v8:12482
Change-Id: I4aa7d4e11a4f498f9adb092e3b98e1edf68401dc
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3320454Reviewed-by: Michael Lippautz <mlippautz@chromium.org>
Commit-Queue: Clemens Backes <clemensb@chromium.org>
Cr-Commit-Position: refs/heads/main@{#78292}