IR: Introduce GenericDwarfNode

As part of PR22235, introduce `DwarfNode` and `GenericDwarfNode`.  The
former is a metadata node with a DWARF tag.  The latter matches our
current (generic) schema of a header with string (and stringified
integer) data and an arbitrary number of operands.

This doesn't move it into place yet; that change will require a large
number of testcase updates.

llvm-svn: 226529

1 files changed, 3 insertions, 3 deletions

diff --git a/llvm/lib/IR/LLVMContextImpl.cpp b/llvm/lib/IR/LLVMContextImpl.cpp
index 0c50a120d5d..81ff9a96f49 100644
--- a/llvm/lib/IR/LLVMContextImpl.cpp
+++ b/llvm/lib/IR/LLVMContextImpl.cpp
@@ -180,11 +180,11 @@ namespace llvm {
 static const Metadata *get_hashable_data(const MDOperand &X) { return X.get(); }
 }
 
-unsigned MDNodeOpsKey::calculateHash(MDNode *N) {
-  unsigned Hash = hash_combine_range(N->op_begin(), N->op_end());
+unsigned MDNodeOpsKey::calculateHash(MDNode *N, unsigned Offset) {
+  unsigned Hash = hash_combine_range(N->op_begin() + Offset, N->op_end());
 #ifndef NDEBUG
   {
-    SmallVector<Metadata *, 8> MDs(N->op_begin(), N->op_end());
+    SmallVector<Metadata *, 8> MDs(N->op_begin() + Offset, N->op_end());
     unsigned RawHash = calculateHash(MDs);
     assert(Hash == RawHash &&
            "Expected hash of MDOperand to equal hash of Metadata*");