There was an issue when trying to use an element from an array constructor
which was a broken in a way probably only Gerhard could conceive.
We hit an assert that can be replaced by more robust code.

Patch is basically Steve's.

Regtested on x86_64-pc-linux-gnu.  OK for mainline?

Thanks,
Harald


Fortran - improve error recovery determining array element from constructor

gcc/fortran/ChangeLog:

	PR fortran/101327
	* expr.c (find_array_element): When bounds cannot be determined as
	constant, return error instead of aborting.

gcc/testsuite/ChangeLog:

	PR fortran/101327
	* gfortran.dg/pr101327.f90: New test.