print_rtx: implement support for reuse IDs (v2)

print_rtx: implement support for reuse IDs (v2)

gcc/ChangeLog:
	* config/i386/i386.c: Include print-rtl.h.
	(selftest::ix86_test_dumping_memory_blockage): New function.
	(selftest::ix86_run_selftests): Call it.
	* print-rtl-function.c (print_rtx_function): Create an
	rtx_reuse_manager and use it.
	* print-rtl.c: Include "rtl-iter.h".
	(rtx_writer::rtx_writer): Add reuse_manager param.
	(rtx_reuse_manager::rtx_reuse_manager): New ctor.
	(uses_rtx_reuse_p): New function.
	(rtx_reuse_manager::preprocess): New function.
	(rtx_reuse_manager::has_reuse_id): New function.
	(rtx_reuse_manager::seen_def_p): New function.
	(rtx_reuse_manager::set_seen_def): New function.
	(rtx_writer::print_rtx): If "in_rtx" has a reuse ID, print it as a
	prefix the first time in_rtx is seen, and print reuse_rtx
	subsequently.
	(print_inline_rtx): Supply NULL for new reuse_manager param.
	(debug_rtx): Likewise.
	(print_rtl): Likewise.
	(print_rtl_single): Likewise.
	(rtx_writer::print_rtl_single_with_indent): Likewise.
	* print-rtl.h: Include bitmap.h when building for host.
	(rtx_writer::rtx_writer): Add reuse_manager param.
	(rtx_writer::m_rtx_reuse_manager): New field.
	(class rtx_reuse_manager): New class.
	* rtl-tests.c (selftest::assert_rtl_dump_eq): Add reuse_manager
	param and use it when constructing rtx_writer.
	(selftest::test_dumping_rtx_reuse): New function.
	(selftest::rtl_tests_c_tests): Call it.
	* selftest-rtl.h (class rtx_reuse_manager): New forward decl.
	(selftest::assert_rtl_dump_eq): Add reuse_manager param.
	(ASSERT_RTL_DUMP_EQ): Supply NULL for reuse_manager param.
	(ASSERT_RTL_DUMP_EQ_WITH_REUSE): New macro.

From-SVN: r243317