fixup! Switch to fixed MD

Created using spr 1.3.8-beta.1

Author: melver

clang/lib/CodeGen/CGExpr.cpp

@@ -1339,7 +1339,7 @@ void CodeGenFunction::EmitAllocTokenHint(llvm::CallBase *CB,
   // Format: !{<type-name>, <contains-pointer>}
   auto *MDN =
       llvm::MDNode::get(CGM.getLLVMContext(), {TypeNameMD, ContainsPtrMD});
-  CB->setMetadata("alloc_token_hint", MDN);
+  CB->setMetadata(llvm::LLVMContext::MD_alloc_token_hint, MDN);
 }
 
 CodeGenFunction::ComplexPairTy CodeGenFunction::

llvm/include/llvm/IR/FixedMetadataKinds.def

@@ -55,3 +55,4 @@ LLVM_FIXED_MD_KIND(MD_mmra, "mmra", 40)
 LLVM_FIXED_MD_KIND(MD_noalias_addrspace, "noalias.addrspace", 41)
 LLVM_FIXED_MD_KIND(MD_callee_type, "callee_type", 42)
 LLVM_FIXED_MD_KIND(MD_nofree, "nofree", 43)
+LLVM_FIXED_MD_KIND(MD_alloc_token_hint, "alloc_token_hint", 44)

llvm/lib/Transforms/Instrumentation/AllocToken.cpp

@@ -149,7 +149,7 @@ STATISTIC(NumAllocations, "Allocations found");
 ///
 /// Expected format is: !{<type-name>, <contains-pointer>}
 MDNode *getAllocTokenHintMetadata(const CallBase &CB) {
-  MDNode *Ret = CB.getMetadata("alloc_token_hint");
+  MDNode *Ret = CB.getMetadata(LLVMContext::MD_alloc_token_hint);
   if (!Ret)
     return nullptr;
   assert(Ret->getNumOperands() == 2 && "bad !alloc_token_hint");

llvm/lib/Transforms/Utils/Local.cpp

@@ -3025,6 +3025,10 @@ static void combineMetadata(Instruction *K, const Instruction *J,
         // Preserve !nosanitize if both K and J have it.
         K->setMetadata(Kind, JMD);
         break;
+      case LLVMContext::MD_alloc_token_hint:
+        // Preserve !alloc_token_hint if both K and J have it.
+        K->setMetadata(Kind, JMD);
+        break;
       }
   }
   // Set !invariant.group from J if J has it. If both instructions have it