Reid Kleckner 966abe7614 MS ABI: Use musttail for thunk IR generation ...

This allows us to perfectly forward non-trivial arguments that use
inalloca.

We still can't forward non-trivial arguments through thunks when we have
a covariant return type with a non-trivial adjustment.  This would
require emitting an extra copy, which is non-conforming anyway.

llvm-svn: 208927

2014-05-15 23:01:46 +00:00

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