Handle GhostLinkage (should not ever reach the assembly printing stage!)

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@17749 91177308-0d34-0410-b5e6-96231b3b80d8

lib/Target/PowerPC/PPCAsmPrinter.cpp

@@ -508,6 +508,9 @@ bool DarwinAsmPrinter::doFinalization(Module &M) {
         case GlobalValue::InternalLinkage:
           SwitchSection(O, CurSection, ".data");
           break;
+        case GlobalValue::GhostLinkage:
+          std::cerr << "Error: unmaterialized (GhostLinkage) function in asm!";
+          abort();
         }
 
         emitAlignment(Align);