PR fortran/100154 - ICE in gfc_conv_procedure_call, at fortran/trans-expr.c:6131

PR fortran/100154 - ICE in gfc_conv_procedure_call, at fortran/trans-expr.c:6131

Add appropriate static checks for the character and status arguments to
the GNU Fortran intrinsic extensions fget[c], fput[c].  Extend variable
check to allow a function reference having a data pointer result.

gcc/fortran/ChangeLog:

	PR fortran/100154
	* check.c (variable_check): Allow function reference having a data
	pointer result.
	(arg_strlen_is_zero): New function.
	(gfc_check_fgetputc_sub): Add static check of character and status
	arguments.
	(gfc_check_fgetput_sub): Likewise.
	* intrinsic.c (add_subroutines): Fix argument name for the
	character argument to intrinsic subroutines fget[c], fput[c].

gcc/testsuite/ChangeLog:

	PR fortran/100154
	* gfortran.dg/pr100154.f90: New test.