Avoid a couple more ICEs in print_mem_ref (PR c/98597).

Avoid a couple more ICEs in print_mem_ref (PR c/98597).

Resolves:
PR c/98597 - ICE in -Wuninitialized printing a MEM_REF
PR c/98592 - ICE in gimple_canonical_types_compatible_p while formatting

gcc/c-family/ChangeLog:

	PR c/98597
	PR c/98592
	* c-pretty-print.c (print_mem_ref): Avoid assuming MEM_REF operand
	has pointer type.  Remove redundant code.  Avoid calling
	gimple_canonical_types_compatible_p.

gcc/testsuite/ChangeLog:

	PR c/98597
	PR c/98592
	* g++.dg/warn/Wuninitialized-13.C: New test.
	 gcc.dg/uninit-39.c: New test.

	#