This reverts commit d09847357b965a2c2cda063827ce362d4c9c86f2 except for
its testcase.

gcc/fortran/
	* intrinsic.c (add_sym_4ind): Remove.
	(add_functions): Use add_sym4 instead of add_sym4ind.
	Don’t special case the index intrinsic.
	* iresolve.c (gfc_resolve_index_func): Use the individual arguments
	directly instead of the full argument list.
	* intrinsic.h (gfc_resolve_index_func): Update the declaration
	accordingly.
	* trans-decl.c (gfc_get_extern_function_decl): Don’t modify the
	list of arguments in the case of the index intrinsic.
---
 gcc/fortran/intrinsic.c  | 48 ++++++----------------------------------
 gcc/fortran/intrinsic.h  |  3 ++-
 gcc/fortran/iresolve.c   | 21 ++++--------------
 gcc/fortran/trans-decl.c | 24 +-------------------
 4 files changed, 14 insertions(+), 82 deletions(-)