swift234

Wire up improved epilogue release matcher with function signature
optimization.

We get some improvements on the # of parameters converted to guanrateed
from owned on the stdlib.

before
======
103 sil-function-signature-opts      - Total owned args -> guaranteed args

after
======
118 sil-function-signature-opts      - Total owned args -> guaranteed args

I see the following improvements by running benchmarks with and without this
change. Only difference >=1.05X

ErrorHandling         8154             7497      -657     -8.1%     1.09x
LinkedList            9973             9529      -444     -4.5%     1.05x
ObjectAllocation      239              222       -17     -7.1%     1.08x
RC4                   23167            21993     -1174     -5.1%     1.05x (!)

This is part of rdar://22380547