[ObjCARC] Add funclet token to ARC marker
The inline assembly generated for the ARC autorelease elision marker
must have a funclet token if it's emitted inside a funclet, otherwise
the inline assembly (and all subsequent code in the funclet) will be
marked unreachable by WinEHPrepare.
Note that this only applies for the non-O0 case, since at O0, clang
emits the autorelease elision marker itself rather than deferring to the
backend. The fix for clang is handled in a separate change.
Differential Revision: https://reviews.llvm.org/D44641
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@328042
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