Revert "[llvm][CFI] Do not canonicalize COFF functions in a comdat (#139962)"

This reverts commit 33684ac.

Reverting since this is breaking a bunch of builders. See the llvm-ci
messages on #139962.

Author: PiJoules

llvm/lib/Transforms/IPO/LowerTypeTests.cpp

@@ -1711,22 +1711,8 @@ void LowerTypeTestsModule::buildBitSetsFromFunctionsNative(
           F->getValueType(), 0, F->getLinkage(), "", CombinedGlobalElemPtr, &M);
       FAlias->setVisibility(F->getVisibility());
       FAlias->takeName(F);
-      if (FAlias->hasName()) {
+      if (FAlias->hasName())
         F->setName(FAlias->getName() + ".cfi");
-        // For COFF we should also rename the comdat if this function also
-        // happens to be the key function. Even if the comdat name changes, this
-        // should still be fine since comdat and symbol resolution happens
-        // before LTO, so all symbols which would prevail have been selected.
-        if (F->hasComdat() && ObjectFormat == Triple::COFF &&
-            F->getComdat()->getName() == FAlias->getName()) {
-          Comdat *OldComdat = F->getComdat();
-          Comdat *NewComdat = M.getOrInsertComdat(F->getName());
-          for (GlobalObject &GO : M.global_objects()) {
-            if (GO.getComdat() == OldComdat)
-              GO.setComdat(NewComdat);
-          }
-        }
-      }
       replaceCfiUses(F, FAlias, IsJumpTableCanonical);
       if (!F->hasLocalLinkage())
         F->setVisibility(GlobalVariable::HiddenVisibility);