SIL optimizer: remove the RemovePin optimization.

Not useful anymore after removing the pinning adressors

Author: eeckstein

include/swift/SILOptimizer/PassManager/Passes.def

@@ -240,8 +240,6 @@ PASS(PerformanceSILLinker, "performance-linker",
      "Deserialize all referenced SIL functions")
 PASS(RawSILInstLowering, "raw-sil-inst-lowering",
      "Lower all raw SIL instructions to canonical equivalents.")
-PASS(RemovePins, "remove-pins",
-     "Remove SIL pin/unpin pairs")
 PASS(TempRValueOpt, "temp-rvalue-opt",
      "Remove short-lived immutable temporary copies")
 PASS(SideEffectsDumper, "side-effects-dump",

lib/SILOptimizer/PassManager/PassPipeline.cpp

@@ -213,7 +213,6 @@ void addHighLevelLoopOptPasses(SILPassPipelinePlan &P) {
   P.addSimplifyCFG();
   P.addArrayElementPropagation();
   // End of unrolling passes.
-  P.addRemovePins();
   P.addABCOpt();
   // Cleanup.
   P.addDCE();
@@ -331,7 +330,6 @@ void addSSAPasses(SILPassPipelinePlan &P, OptimizationLevelKind OpLevel) {
   P.addRetainSinking();
   P.addReleaseHoisting();
   P.addARCSequenceOpts();
-  P.addRemovePins();
 }
 
 static void addPerfDebugSerializationPipeline(SILPassPipelinePlan &P) {

lib/SILOptimizer/Transforms/CMakeLists.txt

@@ -23,7 +23,6 @@ silopt_register_sources(
   RedundantLoadElimination.cpp
   RedundantOverflowCheckRemoval.cpp
   ReleaseDevirtualizer.cpp
-  RemovePin.cpp
   SILCodeMotion.cpp
   SILLowerAggregateInstrs.cpp
   SILMem2Reg.cpp