DI: Use a `DenseMap` instead of named metadata, NFC

Remove a strange round-trip through named metadata to assign preserved
local variables to their subprograms.

llvm-svn: 219798

2 files changed, 3 insertions, 8 deletions

diff --git a/llvm/include/llvm/IR/DIBuilder.h b/llvm/include/llvm/IR/DIBuilder.h
index d12a0c609db..8484d04e914 100644
--- a/llvm/include/llvm/IR/DIBuilder.h
+++ b/llvm/include/llvm/IR/DIBuilder.h
@@ -73,6 +73,9 @@ namespace llvm {
     SmallVector<Value *, 4> AllGVs;
     SmallVector<TrackingVH<MDNode>, 4> AllImportedModules;
 
+    /// Each subprogram's preserved local variables.
+    DenseMap<MDNode *, std::vector<TrackingVH<MDNode>>> PreservedVariables;
+
     // Private use for multiple types of template parameters.
     DITemplateValueParameter
     createTemplateValueParameter(unsigned Tag, DIDescriptor Scope,
diff --git a/llvm/include/llvm/IR/DebugInfo.h b/llvm/include/llvm/IR/DebugInfo.h
index 510c36cb5cd..fe627d52dff 100644
--- a/llvm/include/llvm/IR/DebugInfo.h
+++ b/llvm/include/llvm/IR/DebugInfo.h
@@ -958,14 +958,6 @@ DISubprogram getDISubprogram(const MDNode *Scope);
 /// getDICompositeType - Find underlying composite type.
 DICompositeType getDICompositeType(DIType T);
 
-/// getOrInsertFnSpecificMDNode - Return a NameMDNode that is suitable
-/// to hold function specific information.
-NamedMDNode *getOrInsertFnSpecificMDNode(Module &M, DISubprogram SP);
-
-/// getFnSpecificMDNode - Return a NameMDNode, if available, that is
-/// suitable to hold function specific information.
-NamedMDNode *getFnSpecificMDNode(const Module &M, DISubprogram SP);
-
 /// createInlinedVariable - Create a new inlined variable based on current
 /// variable.
 /// @param DV            Current Variable.