Merge pull request swiftlang#1852 from trentxintong/FSO

Remove function signature rewriter and make function signature analysis a Util

Author: trentxintong

include/swift/SILOptimizer/Analysis/Analysis.def

@@ -30,7 +30,6 @@ ANALYSIS(ClassHierarchy)
 ANALYSIS(Destructor)
 ANALYSIS(Dominance)
 ANALYSIS(Escape)
-ANALYSIS(FunctionSignature)
 ANALYSIS(InductionVariable)
 ANALYSIS(Loop)
 ANALYSIS(LoopRegion)

include/swift/SILOptimizer/Analysis/FunctionSignatureAnalysis.h

@@ -106,8 +106,6 @@ PASS(FunctionOrderPrinter, "function-order-printer",
      "Print function orderings for test purposes")
 PASS(FunctionSignatureOptCloner, "function-signature-opt-cloner",
      "Create function with optimized signatures")
-PASS(FunctionSignatureOptRewriter, "function-signature-opt-rewriter",
-     "Optimize Function Signatures by rewriting callsites")
 PASS(ARCSequenceOpts, "arc-sequence-opts",
      "Optimize sequences of retain/release opts by removing redundant inner "
      "retain/release sequences")