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, 6 insertions, 0 deletions

diff --git a/llvm/lib/IR/AsmWriter.cpp b/llvm/lib/IR/AsmWriter.cpp
index d9165437ec7..56355cc913c 100644
--- a/llvm/lib/IR/AsmWriter.cpp
+++ b/llvm/lib/IR/AsmWriter.cpp
@@ -1286,6 +1286,12 @@ raw_ostream &operator<<(raw_ostream &OS, FieldSeparator &FS) {
 }
 } // end namespace
 
+static void writeGenericDwarfNode(raw_ostream &, const GenericDwarfNode *,
+                                  TypePrinting *, SlotTracker *,
+                                  const Module *) {
+  llvm_unreachable("Unimplemented write");
+}
+
 static void writeMDLocation(raw_ostream &Out, const MDLocation *DL,
                             TypePrinting *TypePrinter, SlotTracker *Machine,
                             const Module *Context) {