Delete the flag -disable-func-sig-opts.

This commit removes the flag -disable-func-sig-opts.

Author: nadavrot

include/swift/AST/SILOptions.h

@@ -89,9 +89,6 @@ class SILOptions {
   /// Should we print out instruction counts if -print-stats is passed in?
   bool PrintInstCounts = false;
 
-  /// Should we optimize function signatures?
-  bool EnableFuncSigOpts = true;
-
   /// Instrument code to generate profiling information.
   bool GenerateProfile = false;
 

include/swift/Option/FrontendOptions.td

@@ -266,9 +266,6 @@ def use_malloc : Flag<["-"], "use-malloc">,
   HelpText<"Allocate internal data structures using malloc "
            "(for memory debugging)">;
 
-def disable_func_sig_opts : Flag<["-"], "disable-func-sig-opts">,
-  HelpText<"Disable function signature optimizations">;
-
 def interpret : Flag<["-"], "interpret">, HelpText<"Immediate mode">, ModeOpt;
 
 def verify_type_layout : JoinedOrSeparate<["-"], "verify-type-layout">,

lib/Frontend/CompilerInvocation.cpp

@@ -991,7 +991,6 @@ static bool ParseSILArgs(SILOptions &Opts, ArgList &Args,
   Opts.DebugSerialization |= Args.hasArg(OPT_sil_debug_serialization);
   Opts.EmitVerboseSIL |= Args.hasArg(OPT_emit_verbose_sil);
   Opts.PrintInstCounts |= Args.hasArg(OPT_print_inst_counts);
-  Opts.EnableFuncSigOpts &= !Args.hasArg(OPT_disable_func_sig_opts);
   if (const Arg *A = Args.getLastArg(OPT_external_pass_pipeline_filename))
     Opts.ExternalPassPipelineFilename = A->getValue();
 

lib/SILPasses/PassManager/Passes.cpp

@@ -299,13 +299,10 @@ void swift::runSILOptimizationPasses(SILModule &Module) {
   // Speculate virtual call targets.
   PM.addSpeculativeDevirtualization();
 
-  // Optimize function signatures if we are asked to.
-  //
   // We do this late since it is a pass like the inline caches that we only want
   // to run once very late. Make sure to run at least one round of the ARC
   // optimizer after this.
-  if (Module.getOptions().EnableFuncSigOpts)
-    PM.addFunctionSignatureOpts();
+  PM.addFunctionSignatureOpts();
 
   PM.runOneIteration();
   PM.resetAndRemoveTransformations();