Revert "[SCEVExp] Add helper to clean up dead instructions after expansion. (#157308)"

This reverts commit 528b13df571c86a2c5b8305d7974f135d785e30f.

Triggers MSan errors in some configurations, e.g.
https://lab.llvm.org/buildbot/#/builders/169/builds/14799

1 files changed, 0 insertions, 16 deletions

diff --git a/llvm/lib/Transforms/Utils/ScalarEvolutionExpander.cpp b/llvm/lib/Transforms/Utils/ScalarEvolutionExpander.cpp
index ef9173b..7c12dac 100644
--- a/llvm/lib/Transforms/Utils/ScalarEvolutionExpander.cpp
+++ b/llvm/lib/Transforms/Utils/ScalarEvolutionExpander.cpp
@@ -26,7 +26,6 @@
 #include "llvm/IR/PatternMatch.h"
 #include "llvm/Support/CommandLine.h"
 #include "llvm/Support/raw_ostream.h"
-#include "llvm/Transforms/Utils/Local.h"
 #include "llvm/Transforms/Utils/LoopUtils.h"
 
 #if LLVM_ENABLE_ABI_BREAKING_CHECKS
@@ -176,21 +175,6 @@ SCEVExpander::findInsertPointAfter(Instruction *I,
   return IP;
 }
 
-void SCEVExpander::eraseDeadInstructions(Value *Root) {
-  SmallVector<Value *> WorkList;
-  append_range(WorkList, getAllInsertedInstructions());
-  while (!WorkList.empty()) {
-    Instruction *I = dyn_cast<Instruction>(WorkList.pop_back_val());
-    if (!I || I == Root || !isInsertedInstruction(I) ||
-        !isInstructionTriviallyDead(I))
-      continue;
-    append_range(WorkList, I->operands());
-    InsertedValues.erase(I);
-    InsertedPostIncValues.erase(I);
-    I->eraseFromParent();
-  }
-}
-
 BasicBlock::iterator
 SCEVExpander::GetOptimalInsertionPointForCastOf(Value *V) const {
   // Cast the argument at the beginning of the entry block, after