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[as] Create a symbol for string

We need the symbol to be able to access to the string stored
in the name field.

--- a/as/expr.c

+++ b/as/expr.c

@@ -237,9 +237,13 @@

 	int c;

 	char *p;

-	for (++endp; *endp++ != '"'; )

+	for (++endp; *endp != '"'; ++endp)

 		;

+	++endp;

 	tok2str();

+	yylval.sym = tmpsym(0);

+	/* FIXME: this memory is not freed ever */

+	yylval.sym->name.buf = xstrdup(yytext);

 	return STRING;

 }

--- a/as/ins.c

+++ b/as/ins.c

@@ -80,8 +80,12 @@

 section(Op *op, Node **args)

 {

 	Symbol *sym = args[0]->sym;

+	char *attr = NULL;

-	setsec(sym->name.buf, NULL);

+	if (args[1])

+		attr = args[1]->sym->name.buf;

+

+	setsec(sym->name.buf, attr);

 }

 void