analyzer: fix bitfield endianness issues [PR99212,PR101082]

analyzer: fix bitfield endianness issues [PR99212,PR101082]

Looks like my patch for PR analyzer/99212 implicitly assumed
little-endian, which the following patch fixes.

Fixes bitfields-1.c on:
- armeb-none-linux-gnueabihf
- cris-elf
- powerpc64-darwin
- s390-linux-gnu

gcc/analyzer/ChangeLog:
	PR analyzer/99212
	PR analyzer/101082
	* engine.cc: Include "target.h".
	(impl_run_checkers): Log BITS_BIG_ENDIAN, BYTES_BIG_ENDIAN, and
	WORDS_BIG_ENDIAN.
	* region-model-manager.cc
	(region_model_manager::maybe_fold_binop): Move support for masking
	via ARG0 & CST into...
	(region_model_manager::maybe_undo_optimize_bit_field_compare):
	...this new function.  Flatten by converting from nested
	conditionals to a series of early return statements to reject
	failures.  Reject if type is not unsigned_char_type_node.
	Handle BYTES_BIG_ENDIAN when determining which bits are bound
	in the binding_map.
	* region-model.h
	(region_model_manager::maybe_undo_optimize_bit_field_compare):
	New decl.
	* store.cc (bit_range::dump): New function.
	* store.h (bit_range::dump): New decl.

Signed-off-by: David Malcolm <dmalcolm@redhat.com>