* mark_rts.c (GC_cond_register_dynamic_libraries): add.
	(GC_push_roots): explicitly mark free list headers, register
	dynamic libraries only if !REGISTER_LIBRARIES_EARLY.
	* alloc.c (GC_stopped_mark): Conditionally call
	GC_cond_register_dynamic_libraries().
	(GC_collect_a_little_inner, GC_try_to_collect_inner): Check GC_dont_gc.
	* dyn_load.c (GC_register_main_static_data): define.
	(GC_register_dyn_libraries (Linux /proc, Linux ELF versions)):
	no longer skip main data.
	* misc.c (GC_REGISTER_MAIN_STATIC_DATA): define.
	(GC_init_inner): Make main data registration conditional.
	* include/private/gc_priv.h (GC_register_main_static_data): declare.
	* include/private/gcconfig.h (REGISTER_LIBRARIES_EARLY): define
	for LINUX.


git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@63727 138bc75d-0d04-0410-961f-82ee72b054a4