MC: Label definitions are permitted after .set directives

.set directives may be overridden by other .set directives as well as
label definitions.

This fixes PR22019.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@224811 91177308-0d34-0410-b5e6-96231b3b80d8

lib/MC/MCParser/AsmParser.cpp

@@ -1298,6 +1298,9 @@ bool AsmParser::parseStatement(ParseStatementInfo &Info,
       Sym = getContext().GetOrCreateSymbol(IDVal);
     } else
       Sym = Ctx.CreateDirectionalLocalSymbol(LocalLabelVal);
+
+    Sym->redefineIfPossible();
+
     if (!Sym->isUndefined() || Sym->isVariable())
       return Error(IDLoc, "invalid symbol redefinition");
 
@@ -2217,6 +2220,8 @@ bool AsmParser::parseAssignment(StringRef Name, bool allow_redef,
   } else
     Sym = getContext().GetOrCreateSymbol(Name);
 
+  Sym->setRedefinable(allow_redef);
+
   // Do the assignment.
   Out.EmitAssignment(Sym, Value);
   if (NoDeadStrip)