Upreferences are always OpaqueTypes, meaning that it is impossible for a non-abstract

type from containing one.  This speeds up the asmparser on the testcase in PR224 from
61->50s.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@11220 91177308-0d34-0410-b5e6-96231b3b80d8

lib/AsmParser/llvmAsmParser.y

@@ -603,6 +603,7 @@ static std::vector<std::pair<unsigned, OpaqueType *> > UpRefs;
 /// thus we can complete the cycle.
 ///
 static PATypeHolder HandleUpRefs(const Type *ty) {
+  if (!ty->isAbstract()) return ty;
   PATypeHolder Ty(ty);
   UR_OUT("Type '" << Ty->getDescription() << 
          "' newly formed.  Resolving upreferences.\n" <<