* mf-runtime.c (__mf_init): Support FreeBSD.
	Prime mutex which calls calloc upon first lock to avoid deadlock.
	* mf-hooks1.c (__mf_0fn_mmap): Support FreeBSD.
	Ignore red zone allocation request for initial thread's stack.


git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@151278 138bc75d-0d04-0410-961f-82ee72b054a4