TableGen/GlobalISel: Emit enum names for reg class ID instead of value

This was emitting the raw value for the reg class ID with a comment
for the actual class name. Switch to emitting the qualified enum name
instead, which obviates the need for the comment and also helps keep
the lit tests on the emitter output more stable.
diff --git a/llvm/utils/TableGen/GlobalISelEmitter.cpp b/llvm/utils/TableGen/GlobalISelEmitter.cpp
index 026f9ad..808ab83 100644
--- a/llvm/utils/TableGen/GlobalISelEmitter.cpp
+++ b/llvm/utils/TableGen/GlobalISelEmitter.cpp
@@ -2960,8 +2960,8 @@
     Table << MatchTable::Opcode("GIR_ConstrainOperandRC")
           << MatchTable::Comment("InsnID") << MatchTable::IntValue(InsnID)
           << MatchTable::Comment("Op") << MatchTable::IntValue(OpIdx)
-          << MatchTable::Comment("RC " + RC.getName())
-          << MatchTable::IntValue(RC.EnumValue) << MatchTable::LineBreak;
+          << MatchTable::NamedValue(RC.getQualifiedName() + "RegClassID")
+          << MatchTable::LineBreak;
   }
 };