S_intuit_method: Move code to earlier

The ARGS_ASSERT was later down in the code because of C89 that we are no
longer restricted by.  Moving it showed a minor flaw: the parameter name
asserted for didn't exist.

The other code being later could throw away calculations we'd made.
Move it to before those calculations

Author: khwilliamson

embed.fnc

@@ -6078,7 +6078,7 @@ RS	|SV *	|get_and_check_backslash_N_name_wrapper 		\
 				|NN const char * const e
 S	|void	|incline	|NN const char *s			\
 				|NN const char *end
-S	|int	|intuit_method	|NN char *s				\
+S	|int	|intuit_method	|NN char *start 			\
 				|NULLOK SV *ioname			\
 				|NULLOK NOCHECK CV *cv
 S	|int	|intuit_more	|NN char *s				\

proto.h

@@ -4774,6 +4774,11 @@ S_intuit_more(pTHX_ char *s, char *e)
 STATIC int
 S_intuit_method(pTHX_ char *start, SV *ioname, CV *cv)
 {
+    PERL_ARGS_ASSERT_INTUIT_METHOD;
+
+    if (!FEATURE_INDIRECT_IS_ENABLED)
+        return 0;
+
     char *s = start + (*start == '$');
     char tmpbuf[sizeof PL_tokenbuf];
     STRLEN len;
@@ -4785,11 +4790,6 @@ S_intuit_method(pTHX_ char *start, SV *ioname, CV *cv)
     GV * const gv =
         ioname ? gv_fetchsv(ioname, GV_NOADD_NOINIT, SVt_PVCV) : NULL;
 
-    PERL_ARGS_ASSERT_INTUIT_METHOD;
-
-    if (!FEATURE_INDIRECT_IS_ENABLED)
-        return 0;
-
     if (gv && SvTYPE(gv) == SVt_PVGV && GvIO(gv))
             return 0;
     if (cv && SvPOK(cv)) {