gfortran.dg/gomp/depend-4.f90: minor fix + dump update

gfortran.dg/gomp/depend-4.f90: minor fix + dump update

Contains the minor fix of upstream commit
r13-2151-g6b2a584ed5bed1b851ee7b4668ac705f20cbb2c4
to avoid setting the same array element twice.

Additionally, it updates the expected tree dumps due to differences
between GCC 12/OG12 and mainline (GCC13); the latter seems to
use a restricted pointer of type '&a[1]' while OG12 has pointerplus
expressions like 'a + 4'.

The changes include -m32/-m64 handling for the depobj var and in
two cases, the expected count increases from 1 to 2 for code like
'D.\[0-9\]+ = daa'.

gcc/testsuite/

	* gfortran.dg/gomp/depend-4.f90: Update expected tree dumps.