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Junliang Yan authored
Port 591408cb Original Commit Message: We'll need one bit in the SharedFunctionInfo::flags to record whether it's safe to skip arguments adaptor frames (for v8:8895), so this just removes the SharedFunctionInfo::IsDerivedConstructorBit which is redundant, since the same information is already available in the SharedFunctionInfo::FunctionKindBits, and most places in the code use that already, with the exception of the JSConstructStubGeneric builtin. This changes the JSConstructStubGeneric builtin to just check the function kind instead of testing the explicit bit, which also makes this more consistent. It seems like there's not much overhead to that, doing an additional bitmasking plus two comparisons instead of one. This shouldn't really matter since invocation and execution of the constructors is going to dominate and optimized code inlines all of this anyways. If this turns out to affect performance, we can still look into encoding the FunctionKindBits more cleverly. the shift when accessing the function kind. This seems logic, since for the actual boolean bit fields it doesn't matter where they are in the flags, whereas for the function kind this saves one shift. R=bmeurer@chromium.org, joransiu@ca.ibm.com, michael_dawson@ca.ibm.com, miladfar@ca.ibm.com BUG= LOG=N Change-Id: I4e3ba5a066285bf50e869c32228d79d26d57258f Reviewed-on: https://chromium-review.googlesource.com/c/1486411Reviewed-by: Milad Farazmand <miladfar@ca.ibm.com> Commit-Queue: Junliang Yan <jyan@ca.ibm.com> Cr-Commit-Position: refs/heads/master@{#59837}
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