PR tree-optimization/92373 - ICE in -Warray-bounds on access to member array in an initialized char buffer

gcc/testsuite/ChangeLog:

	PR tree-optimization/92373
	* gcc.dg/Warray-bounds-55.c: New test.
	* gcc.dg/Wzero-length-array-bounds-2.c: New test.

gcc/ChangeLog:

	PR tree-optimization/92373
	* tree.c (component_ref_size): Only consider initializers of objects
	of matching struct types.
	Return null for instances of interior zero-length arrays.

From-SVN: r277871