middle-end/102360 - adjust .DEFERRED_INIT expansion

This avoids using native_interpret_type when we cannot do it with
the original type of the variable, instead use an integer type
for the initialization and side-step the size limitation of
native_interpret_int.

2021-09-16  Richard Biener  <rguenther@suse.de>

	PR middle-end/102360
	* internal-fn.c (expand_DEFERRED_INIT): Make pattern-init
	of non-memory more robust.

	* g++.dg/pr102360.C: New testcase.