[stringrefs] Fix array-to-string instruction
To make an array from a string, we were passing an interior pointer to the array's contents to NewStringFromUtf8 -- but the allocation could cause that interior pointer to become invalid. As part of the fix, also start to refactor to put the notion of UTF-8 variants closer to unibrow. This will allow us to unify more UTF-8/WTF-8/sloppy UTF-8 code paths. Bug: v8:12868, v8:13028, v8:13036 Change-Id: I61f53a6882b5ebe1d0b38594412cb35ff0e28a94 Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3742701 Commit-Queue: Andy Wingo <wingo@igalia.com> Reviewed-by:Jakob Kummerow <jkummerow@chromium.org> Cr-Commit-Position: refs/heads/main@{#81536}
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