[NFC][SILOptimizer]: remove seemingly unused StripDebugInfo pass

Author: jamieQ

include/swift/SILOptimizer/PassManager/Passes.def

@@ -434,8 +434,6 @@ LEGACY_PASS(SplitAllCriticalEdges, "split-critical-edges",
      "Split all Critical Edges in the SIL CFG")
 LEGACY_PASS(SplitNonCondBrCriticalEdges, "split-non-cond_br-critical-edges",
      "Split all Critical Edges not from SIL cond_br")
-LEGACY_PASS(StripDebugInfo, "strip-debug-info",
-     "Strip Debug Information")
 LEGACY_PASS(StringOptimization, "string-optimization",
      "Optimization for String operations")
 LEGACY_PASS(SwiftArrayPropertyOpt, "array-property-opt",

lib/SILOptimizer/UtilityPasses/CMakeLists.txt

@@ -27,7 +27,6 @@ target_sources(swiftSILOptimizer PRIVATE
   SILDebugInfoGenerator.cpp
   SILSkippingChecker.cpp
   SimplifyUnreachableContainingBlocks.cpp
-  StripDebugInfo.cpp
   TestRunner.cpp
   OwnershipDumper.cpp
   OwnershipVerifierTextualErrorDumper.cpp)

lib/SILOptimizer/UtilityPasses/StripDebugInfo.cpp

@@ -48,7 +48,6 @@
 SpeculativeDevirtualizer = Pass('SpeculativeDevirtualizer')
 SplitAllCriticalEdges = Pass('SplitAllCriticalEdges')
 SplitNonCondBrCriticalEdges = Pass('SplitNonCondBrCriticalEdges')
-StripDebugInfo = Pass('StripDebugInfo')
 SwiftArrayOpts = Pass('SwiftArrayOpts')
 
 PASSES = [
@@ -97,6 +96,5 @@
     SpeculativeDevirtualizer,
     SplitAllCriticalEdges,
     SplitNonCondBrCriticalEdges,
-    StripDebugInfo,
     SwiftArrayOpts,
 ]