John McCall 590c25479d Use isa-masking to read the class object pointer from ...

instances of Swift subclasses of ObjC classes.

We were already doing this in the runtime.  This patch
unhides the runtime's mask word (swift_isaMask) and makes
IR-gen take advantage of it when it can.

Swift SVN r21592

2014-08-29 21:36:53 +00:00

1.6 KiB

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