Add `begin_keywords support

git-svn-id: file://localhost/svn/verilator/trunk/verilator@894 77ca24e4-aefa-0310-84f0-b9a241c72d87

src/V3Read.cpp

@@ -62,10 +62,10 @@ public:
     // METHODS
     void stateExitPsl() {
 	if (YY_START != PSL) yyerror("Internal error: Exiting PSL state when not in PSL state");
-	BEGIN S05;
+	yy_pop_state();
     }
     void statePushVlg() {
-	yy_push_state(S05);
+	yy_push_state(STATE_VERILOG_RECENT);
     }
     void statePop() {
 	yy_pop_state();