OpenMP: modify_call_for_omp_dispatch - fix invalid memory access after 'error' [PR119541]

OpenMP: modify_call_for_omp_dispatch - fix invalid memory access after 'error' [PR119541]

OpenMP requires that the number of dispatch 'interop' clauses (ninterop)
is less or equal to the number of declare variant 'append_args' interop
objects (nappend).

While 'nappend < ninterop' was diagnosed as error, the processing continues,
which lead to an invalid out-of-bounds memory access. Solution: only
process the first nappend 'interop' clauses.

gcc/ChangeLog:

	PR middle-end/119541
	* gimplify.cc (modify_call_for_omp_dispatch): Limit interop claues
	processing by the number of append_args arguments.