Make bitfields only as wide as necessary for enums
clang now complains when a BitField for an enum is too wide. We could suppress this, but it seems kind of useful from an uninformed distance, so I made a few bitfields smaller instead. (For AddressingMode, since its size is target-dependent, I added an explicit underlying type to the enum instead, which suppresses the diag on a per-enum basis.) This is without any understanding of the code I'm touching. Especially the change in v8-internal.h feels a bit risky to me. Bug: chromium:1348574 Change-Id: I73395de593045036b72dadf4e3147b5f7e13c958 Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3794708 Commit-Queue: Nico Weber <thakis@chromium.org> Reviewed-by: Leszek Swirski <leszeks@chromium.org> Reviewed-by: Hannes Payer <hpayer@chromium.org> Auto-Submit: Nico Weber <thakis@chromium.org> Cr-Commit-Position: refs/heads/main@{#82109}
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