glsl: Add other missing error location information for switch statements.

NOTE: This is a candidate for the 8.0 branch.

Reviewed-by: Ian Romanick <ian.d.romanick@intel.com>

src/glsl/glsl_parser.yy

 	SWITCH '(' expression ')' switch_body
 	{
 	   $$ = new(state) ast_switch_statement($3, $5);
+	   $$->set_location(yylloc);
 	}
 	;
 
 
 	   labels->labels.push_tail(& $1->link);
 	   $$ = labels;
+	   $$->set_location(yylloc);
 	}
 	| case_label_list case_label
 	{
 	case_label_list statement
 	{
 	   ast_case_statement *stmts = new(state) ast_case_statement($1);
+	   stmts->set_location(yylloc);
 
 	   stmts->stmts.push_tail(& $2->link);
 	   $$ = stmts;
 	case_statement
 	{
 	   ast_case_statement_list *cases= new(state) ast_case_statement_list();
+	   cases->set_location(yylloc);
 
 	   cases->cases.push_tail(& $1->link);
 	   $$ = cases;