re PR fortran/31119 (-fbounds-check: Check for presence of optional arguments before bound checking)

	PR fortran/31119

	* trans-array.c (gfc_conv_ss_startstride): Only perform bounds
	checking for optional args when they are present.

	* gfortran.dg/bounds_check_9.f90: New test.
	* gfortran.dg/bounds_check_fail_2.f90: New test.

From-SVN: r128587