[Scalar] Use LLVMContext::MD_mem_parallel_loop_access (NFC)

Author: kazutakahirata

llvm/lib/Transforms/Scalar/Scalarizer.cpp

@@ -447,11 +447,9 @@ bool ScalarizerLegacyPass::runOnFunction(Function &F) {
   if (skipFunction(F))
     return false;
 
-  Module &M = *F.getParent();
-  unsigned ParallelLoopAccessMDKind =
-      M.getContext().getMDKindID("llvm.mem.parallel_loop_access");
   DominatorTree *DT = &getAnalysis<DominatorTreeWrapperPass>().getDomTree();
-  ScalarizerVisitor Impl(ParallelLoopAccessMDKind, DT, ScalarizerPassOptions());
+  ScalarizerVisitor Impl(LLVMContext::MD_mem_parallel_loop_access, DT,
+                         ScalarizerPassOptions());
   return Impl.visit(F);
 }
 
@@ -1254,11 +1252,8 @@ bool ScalarizerVisitor::finish() {
 }
 
 PreservedAnalyses ScalarizerPass::run(Function &F, FunctionAnalysisManager &AM) {
-  Module &M = *F.getParent();
-  unsigned ParallelLoopAccessMDKind =
-      M.getContext().getMDKindID("llvm.mem.parallel_loop_access");
   DominatorTree *DT = &AM.getResult<DominatorTreeAnalysis>(F);
-  ScalarizerVisitor Impl(ParallelLoopAccessMDKind, DT, Options);
+  ScalarizerVisitor Impl(LLVMContext::MD_mem_parallel_loop_access, DT, Options);
   bool Changed = Impl.visit(F);
   PreservedAnalyses PA;
   PA.preserve<DominatorTreeAnalysis>();