MC/AsmParser: Generalize a check.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@130515 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/MC/MCParser/AsmParser.cpp b/lib/MC/MCParser/AsmParser.cpp
index d7ac5a7..d8fd27d 100644
--- a/lib/MC/MCParser/AsmParser.cpp
+++ b/lib/MC/MCParser/AsmParser.cpp
@@ -1348,7 +1348,7 @@
     // FIXME: Diagnose assignment to protected identifier (e.g., register name).
     if (Sym->isUndefined() && !Sym->isUsed() && !Sym->isVariable())
       ; // Allow redefinitions of undefined symbols only used in directives.
-    else if (!Sym->isUndefined() && (!Sym->isAbsolute() || !allow_redef))
+    else if (!Sym->isUndefined() && (!Sym->isVariable() || !allow_redef))
       return Error(EqualLoc, "redefinition of '" + Name + "'");
     else if (!Sym->isVariable())
       return Error(EqualLoc, "invalid assignment to '" + Name + "'");