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cc1: Fix namespace for enumerations

The namespace must be modified before any token operation
is performed, otherwise we pollute the wrong namespace and
we insert the enum constants in other namespaces.

--- a/src/cmd/cc/cc1/decl.c

+++ b/src/cmd/cc/cc1/decl.c

@@ -796,12 +796,12 @@

 	tagsym = newtag();

 	tp = tagsym->type;

+	namespace = NS_IDEN;

 	if (!accept('{'))

 		goto restore_name;

 	if (tp->prop & TDEFINED)

 		errorp("redefinition of enumeration '%s'", tagsym->name);

 	deftype(tp);

-	namespace = NS_IDEN;

 	/* TODO: check incorrect values in val */

 	for (nctes = val = 0; yytoken != '}'; ++nctes, ++val) {