Introduce enum values for previously defined metadata types. (NFC)

Our metadata scheme lazily assigns IDs to string metadata, but we have a mechanism to preassign them as well.  Using a preassigned ID is helpful since we get compile time type checking, and avoid some (minimal) string construction and comparison.  This change adds enum value for three existing metadata types:
+    MD_nontemporal = 9, // "nontemporal"
+    MD_mem_parallel_loop_access = 10, // "llvm.mem.parallel_loop_access"
+    MD_nonnull = 11 // "nonnull"

I went through an updated various uses as well.  I made no attempt to get all uses; I focused on the ones which were easily grepable and easily to translate.  For example, there were several items in LoopInfo.cpp I chose not to update.

llvm-svn: 220248

2 files changed, 4 insertions, 2 deletions

diff --git a/llvm/lib/Analysis/LoopInfo.cpp b/llvm/lib/Analysis/LoopInfo.cpp
index 46c0eaabe1a..2e0fdeca948 100644
--- a/llvm/lib/Analysis/LoopInfo.cpp
+++ b/llvm/lib/Analysis/LoopInfo.cpp
@@ -24,6 +24,7 @@
 #include "llvm/IR/Constants.h"
 #include "llvm/IR/Dominators.h"
 #include "llvm/IR/Instructions.h"
+#include "llvm/IR/LLVMContext.h"
 #include "llvm/IR/Metadata.h"
 #include "llvm/Support/CommandLine.h"
 #include "llvm/Support/Debug.h"
@@ -307,7 +308,8 @@ bool Loop::isAnnotatedParallel() const {
       // directly or indirectly through another list metadata (in case of
       // nested parallel loops). The loop identifier metadata refers to
       // itself so we can check both cases with the same routine.
-      MDNode *loopIdMD = II->getMetadata("llvm.mem.parallel_loop_access");
+      MDNode *loopIdMD =
+        II->getMetadata(LLVMContext::MD_mem_parallel_loop_access);
 
       if (!loopIdMD)
         return false;
diff --git a/llvm/lib/Analysis/ValueTracking.cpp b/llvm/lib/Analysis/ValueTracking.cpp
index 462d5b7cf0b..53f3be51665 100644
--- a/llvm/lib/Analysis/ValueTracking.cpp
+++ b/llvm/lib/Analysis/ValueTracking.cpp
@@ -2624,7 +2624,7 @@ bool llvm::isKnownNonNull(const Value *V, const TargetLibraryInfo *TLI) {
 
   // A Load tagged w/nonnull metadata is never null. 
   if (const LoadInst *LI = dyn_cast<LoadInst>(V))
-    return LI->getMetadata("nonnull");
+    return LI->getMetadata(LLVMContext::MD_nonnull);
 
   if (ImmutableCallSite CS = V)
     if (CS.isReturnNonNull())