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Summary: Often, a code will call multiple virtual methods of a given object. If they go in a linear block, it should be possible to check vtable before the first call, then store vtable pointer and reuse it for the second vcall without any additional checks. This is expected to have a positive performance impact on a hot path in Blink, see https://crbug.com/634139. Reviewers: kcc Differential Revision: https://reviews.llvm.org/D23151 llvm-svn: 277795