swift234

Fix an off-by-one in r9905, which patched MandatoryInlining to avoid
invalidating iterators.  The off-by one would lead to it failing to 
remove retain/release pairs around partial_apply's on inlined closures,
preventing the partial_apply itself from being removed, and thus making
it look like lots of values (including self) escape.

Fixing this bug allows us to re-enable the String append test and unxfails
three perf tests.


Swift SVN r10425