FreeBSD New ports collection for boehm-gc v7.1

FreeBSD New ports collection for boehm-gc v7.1
(Imported from freebsd-ports/devel/boehm-gc)

* Makefile.in (pkgdatadir): Move to "doc" folder.
* configure (Configuration of machine-dependent code): Handle
sparc64-*-freebsd*.
* dbg_mlc.c (GC_caller_func_offset): New function (empty unless
FreeBSD).
* dbg_mlc.c (GC_debug_malloc, GC_debug_realloc): Invoke
GC_caller_func_offset if GC_ADD_CALLER.
* dbg_mlc.c (RA): Define to GC_RETURN_ADDR_PARENT (if the latter is
defined).
* dbg_mlc.c (GC_debug_malloc_replacement,
GC_debug_realloc_replacement): Pass NULL (instead of "unknown") to
GC_debug_malloc/realloc.
* doc/gc.man: Add "PORT INFORMATION".
* dyn_load.c (ElfW): Define for FreeBSD.
* include/private/gcconfig.h (X86_64, IA64, POWERPC, ARM32,
mach_type_known, ALIGNMENT, OS_TYPE, DYNAMIC_LOADING, HEURISTIC2,
etext, SEARCH_FOR_DATA_START): Likewise.
* os_dep.c (old_bus_act): Likewise.
* include/gc.h (GC_RETURN_ADDR_PARENT): New macro.
* os_dep.c (GC_set_and_save_fault_handler): Invoke sigaction(SIGBUS)
for FreeBSD.
* os_dep.c (AIM): Define before include machine/trap.h if FreeBSD/ppc.
* os_dep.c (CODE_OK): Define to test "code" against EXC_DSI (instead
of BUS_PAGE_FAULT) if FreeBSD/ppc.