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mbrandy authored
Port 5d875a57 Original commit message: The previous hack with HInstanceOfKnownGlobal was not only slower, but also very brittle and required a lot of weird hacks to support it. And what's even more important it wasn't even correct (because a map check on the lhs is never enough for instanceof). The new implementation provides a sane runtime implementation for InstanceOf plus a fast case in the InstanceOfStub, combined with a proper specialization in the case of a known global in CrankShaft, which does only the prototype chain walk (coupled with a code dependency on the known global). As a drive-by-fix: Also fix the incorrect Object.prototype.isPrototypeOf implementation. R=bmeurer@chromium.org, jyan@ca.ibm.com, dstence@us.ibm.com, joransiu@ca.ibm.com BUG=v8:4376 LOG=n Review URL: https://codereview.chromium.org/1314263002 Cr-Commit-Position: refs/heads/master@{#30419}
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