Annotate dump() methods with LLVM_DUMP_METHOD, addressing Richard Smith r259192 post commit comment.
clang part in r259232, this is the LLVM part of the patch.

llvm-svn: 259240
diff --git a/llvm/lib/TableGen/TGParser.cpp b/llvm/lib/TableGen/TGParser.cpp
index 3b8ce00..e167529 100644
--- a/llvm/lib/TableGen/TGParser.cpp
+++ b/llvm/lib/TableGen/TGParser.cpp
@@ -45,7 +45,7 @@
   void dump() const;
 };
 
-void SubMultiClassReference::dump() const {
+LLVM_DUMP_METHOD void SubMultiClassReference::dump() const {
   errs() << "Multiclass:\n";
 
   MC->dump();