[LLParser] Remove redundant remangling (NFCI)

UpgradeCallsToIntrinsic() is already intended to perform remangling
in case no other upgrades are necessary. The additional
remangleIntrinsicFunction() calls are not needed and can hide bugs
in the UpgradeCallsToIntrinsic() implementation.

llvm/lib/AsmParser/LLParser.cpp

@@ -303,16 +303,6 @@ bool LLParser::validateEndOfModule(bool UpgradeDebugInfo) {
   for (Function &F : llvm::make_early_inc_range(*M))
     UpgradeCallsToIntrinsic(&F);
 
-  // Some types could be renamed during loading if several modules are
-  // loaded in the same LLVMContext (LTO scenario). In this case we should
-  // remangle intrinsics names as well.
-  for (Function &F : llvm::make_early_inc_range(*M)) {
-    if (auto Remangled = Intrinsic::remangleIntrinsicFunction(&F)) {
-      F.replaceAllUsesWith(*Remangled);
-      F.eraseFromParent();
-    }
-  }
-
   if (UpgradeDebugInfo)
     llvm::UpgradeDebugInfo(*M);