[objects] Deprecate GetIsolate/Heap behind a flag
Adds a new flag v8_deprecate_get_isolate that marks HeapObject::GetIsolate/GetHeap, Handle<T>(T*) and handle<T>(T*) as [[deprecated]]. Deprecation warnings are not converted to errors so an entire build can be completed to collect all the warnings. Also adds a new script tools/collect_deprecation_stats.sh which runs the build (assuming the flag is set) and collects the number of uses of deprecated functions. E.g. at the time of upload, we get: Total deprecated calls: 2265 515 GetHeap 842 GetIsolate 210 handle 698 Handle Bug: v8:7786 Change-Id: I7043c597fa90bc77759a357ef3c2a5fefe933491 Reviewed-on: https://chromium-review.googlesource.com/1082478Reviewed-by:Yang Guo <yangguo@chromium.org> Commit-Queue: Dan Elphick <delphick@chromium.org> Cr-Commit-Position: refs/heads/master@{#53475}
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