gengtype: do not skip char after escape sequnce

Right now, when a \$x escape sequence occures, the
next character after $x is skipped, which is bogus.

The code has very low coverage right now.

gcc/ChangeLog:

	* gengtype-state.cc (read_a_state_token): Do not skip extra
	character after escaped sequence.

gcc/gengtype-state.cc

@@ -473,43 +473,33 @@ read_a_state_token (void)
 		{
 		case 'a':
 		  obstack_1grow (&bstring_obstack, '\a');
-		  getc (state_file);
 		  break;
 		case 'b':
 		  obstack_1grow (&bstring_obstack, '\b');
-		  getc (state_file);
 		  break;
 		case 't':
 		  obstack_1grow (&bstring_obstack, '\t');
-		  getc (state_file);
 		  break;
 		case 'n':
 		  obstack_1grow (&bstring_obstack, '\n');
-		  getc (state_file);
 		  break;
 		case 'v':
 		  obstack_1grow (&bstring_obstack, '\v');
-		  getc (state_file);
 		  break;
 		case 'f':
 		  obstack_1grow (&bstring_obstack, '\f');
-		  getc (state_file);
 		  break;
 		case 'r':
 		  obstack_1grow (&bstring_obstack, '\r');
-		  getc (state_file);
 		  break;
 		case '"':
 		  obstack_1grow (&bstring_obstack, '\"');
-		  getc (state_file);
 		  break;
 		case '\\':
 		  obstack_1grow (&bstring_obstack, '\\');
-		  getc (state_file);
 		  break;
 		case ' ':
 		  obstack_1grow (&bstring_obstack, ' ');
-		  getc (state_file);
 		  break;
 		case 'x':
 		  {