swift234

[Closure Specializer] add it to pass manager.

PerfTests -----
Before
Totals,54,93821,93821,93821,0,0
Totals,54,86755,86755,86755,0,0

After
Totals,54,93610,93610,93610,0,0
Totals,54,85780,85780,85780,0,0

We may be able to tune BoostFactor for closure in PerformanceInliner.


Swift SVN r21312