Remove unnecessary pg_verifymbstr() calls from tsvector/query in functions.

The input should've been validated well before it hits the input function.
Doing so again is a waste of cycles.

src/backend/utils/adt/tsquery.c

@@ -570,8 +570,6 @@ tsqueryin(PG_FUNCTION_ARGS)
 {
 	char	   *in = PG_GETARG_CSTRING(0);
 
-	pg_verifymbstr(in, strlen(in), false);
-
 	PG_RETURN_TSQUERY(parse_tsquery(in, pushval_asis, PointerGetDatum(NULL), false));
 }
 

src/backend/utils/adt/tsvector.c

@@ -198,8 +198,6 @@ tsvectorin(PG_FUNCTION_ARGS)
 	char	   *cur;
 	int			buflen = 256;	/* allocated size of tmpbuf */
 
-	pg_verifymbstr(buf, strlen(buf), false);
-
 	state = init_tsvector_parser(buf, false, false);
 
 	arrlen = 64;