Revert "[InstCombine] Fix infinite loop due to bitcast <-> phi transforms"

This reverts commit 27a0795943fee0f30b995fe5165428afc2dfd402.

Seems to break test-suite.

1 files changed, 0 insertions, 6 deletions

diff --git a/llvm/lib/Transforms/InstCombine/InstCombineCasts.cpp b/llvm/lib/Transforms/InstCombine/InstCombineCasts.cpp
index 446e675..3ba56bb 100644
--- a/llvm/lib/Transforms/InstCombine/InstCombineCasts.cpp
+++ b/llvm/lib/Transforms/InstCombine/InstCombineCasts.cpp
@@ -2370,12 +2370,6 @@ Instruction *InstCombiner::optimizeBitCastFromPhi(CastInst &CI, PHINode *PN) {
         llvm_unreachable("all uses should be handled");
       }
     }
-
-    // At this point the old phi has either no users, or is only used
-    // in other old phis. Replace with undef to break circles and remove
-    // the instruction.
-    replaceInstUsesWith(*OldPN, UndefValue::get(OldPN->getType()));
-    eraseInstFromFunction(*OldPN);
   }
 
   return RetVal;