swift234

Reimplement evaluateCloseness in terms of the existing 
decomposeArgParamType/matchCallArguments logic used by the rest of
sema, instead of doing its own home grown (and really bad) argument
matching stuff.

NFC since the later argument remapping logic doesn't make use of the same
approach yet, and we're not doing anything with CC_ArgumentLabelMismatch
in visitApplyExpr.


Swift SVN r31759