[turbofan] Pass Truncation::Any() for memory access indices.
For 64-bit indices it's not safe to pass Truncation::Word32() for indices, as operations will incorrectly truncate the outputs to 32-bit integers. There's also not really a point in not passing Truncation::Any(), but it might have performance impact (since we misuse IsUsedAsWord32 in various places). Bug: v8:8178 Change-Id: Ie33b8e03a82e46e314dfb3f268c74c9356653aec Reviewed-on: https://chromium-review.googlesource.com/1230653Reviewed-by: Jaroslav Sevcik <jarin@chromium.org> Commit-Queue: Benedikt Meurer <bmeurer@chromium.org> Cr-Commit-Position: refs/heads/master@{#56006}
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