llvm-undname: Fix another crash-on-invalid

This fixes a regression from https://reviews.llvm.org/D60354. We used to

  SymbolNode *Symbol = demangleEncodedSymbol(MangledName, QN);
  if (Symbol) {
    Symbol->Name = QN;
  }

but changed that to
  SymbolNode *Symbol = demangleEncodedSymbol(MangledName, QN);
  if (Error)
    return nullptr;
  Symbol->Name = QN;

and one branch somewhere returned a nullptr without setting Error.

Looking at the code changed in r340083 and r340710 that branch looks
like a remnant from an earlier attempt to demangle RTTI descriptors
that has since been rewritten -- so just remove this branch. It
shouldn't change behavior for correctly mangled symbols.

llvm-svn: 358112

lib/Demangle/MicrosoftDemangle.cpp

@@ -696,8 +696,6 @@ SymbolNode *Demangler::demangleEncodedSymbol(StringView &MangledName,
     StorageClass SC = demangleVariableStorageClass(MangledName);
     return demangleVariableEncoding(MangledName, SC);
   }
-  case '8':
-    return nullptr;
   }
   FunctionSymbolNode *FSN = demangleFunctionEncoding(MangledName);