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

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

@@ -1,51 +0,0 @@
-//===--- StripDebugInfo.cpp - Strip debug info from SIL -------------------===//
-//
-// This source file is part of the Swift.org open source project
-//
-// Copyright (c) 2014 - 2017 Apple Inc. and the Swift project authors
-// Licensed under Apache License v2.0 with Runtime Library Exception
-//
-// See https://swift.org/LICENSE.txt for license information
-// See https://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
-//
-//===----------------------------------------------------------------------===//
-
-#include "swift/SILOptimizer/PassManager/Passes.h"
-#include "swift/SILOptimizer/PassManager/Transforms.h"
-#include "swift/SIL/SILInstruction.h"
-#include "swift/SIL/SILModule.h"
-#include "swift/SIL/SILFunction.h"
-
-
-using namespace swift;
-
-static void stripFunction(SILFunction *F) {
-  for (auto &BB : *F)
-    for (auto II = BB.begin(), IE = BB.end(); II != IE;) {
-      SILInstruction *Inst = &*II;
-      ++II;
-
-      if (!isa<DebugValueInst>(Inst))
-        continue;
-
-      Inst->eraseFromParent();
-    }
-}
-
-namespace {
-class StripDebugInfo : public swift::SILFunctionTransform {
-  ~StripDebugInfo() override {}
-
-  /// The entry point to the transformation.
-  void run() override {
-    stripFunction(getFunction());
-    invalidateAnalysis(SILAnalysis::InvalidationKind::Instructions);
-  }
-
-};
-} // end anonymous namespace
-
-
-SILTransform *swift::createStripDebugInfo() {
-  return new StripDebugInfo();
-}

test/SILOptimizer/strip_debug_info.sil

@@ -1,18 +0,0 @@
-// RUN: %target-sil-opt -enable-sil-verify-all -strip-debug-info %s | %FileCheck %s
-
-sil_stage canonical
-
-import Swift
-import Builtin
-
-// CHECK-LABEL: sil @test
-// CHECK: bb0
-// CHECK-NEXT: tuple
-// CHECK-NEXT: return
-sil @test : $@convention(thin) <T> (@inout T, Builtin.Int64) -> () {
-bb0(%0 : $*T, %1 : $Builtin.Int64):
-  debug_value %0 : $*T, expr op_deref
-  debug_value %1 : $Builtin.Int64
-  %2 = tuple ()
-  return %2 : $()
-}

utils/pass-pipeline/src/passes.py

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