[RDF] Add operator<<(raw_ostream&, RegisterAggr), NFC

Author: Krzysztof Parzyszek

llvm/include/llvm/CodeGen/RDFRegisters.h

@@ -258,6 +258,8 @@ namespace rdf {
     LaneBitmask Mask;
   };
   raw_ostream &operator<< (raw_ostream &OS, const PrintLaneMaskOpt &P);
+
+  raw_ostream &operator<< (raw_ostream &OS, const RegisterAggr &A);
 } // end namespace rdf
 
 } // end namespace llvm

llvm/lib/CodeGen/RDFRegisters.cpp

@@ -374,3 +374,8 @@ RegisterAggr::rr_iterator::rr_iterator(const RegisterAggr &RG,
   Pos = End ? Masks.end() : Masks.begin();
   Index = End ? Masks.size() : 0;
 }
+
+raw_ostream &rdf::operator<<(raw_ostream &OS, const RegisterAggr &A) {
+  A.print(OS);
+  return OS;
+}