ivmai / bdwgc / 1340

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Define macros in gcconfig.h to use sigaction for SIGSEGV and SIGBUS
(refactoring)

* include/private/gcconfig.h [FREEBSD || HAIKU || HURD || IRIX5
|| NETBSD || OPENBSD || OSF1 || SUNOS5SIGS] (USE_SEGV_SIGACT): New
macro.
* include/private/gcconfig.h [IRIX5 && _sigargs || FREEBSD
&& SUNOS5SIGS || HPUX || HURD || NETBSD] (USE_BUS_SIGACT): Likewise.
* os_dep.c [NEED_FIND_LIMIT || UNIX_LIKE || WRAP_MARK_SOME && !MSWIN32
&& !MSWINCE]: Replace SUNOS5SIGS || IRIX5 || OSF1 || HAIKU || HURD
|| FREEBSD || NETBSD to USE_SEGV_SIGACT.
* os_dep.c [(NEED_FIND_LIMIT || UNIX_LIKE || WRAP_MARK_SOME && !MSWIN32
&& !MSWINCE) && USE_SEGV_SIGACT] (old_segv_act): Do not define if
OPENBSD.
* os_dep.c [(NEED_FIND_LIMIT || UNIX_LIKE || WRAP_MARK_SOME && !MSWIN32
&& !MSWINCE) && USE_SEGV_SIGACT]: Replace _sigargs || HPUX || HURD
|| NETBSD || FREEBSD to USE_BUS_SIGACT.
* os_dep.c [(NEED_FIND_LIMIT || UNIX_LIKE || WRAP_MARK_SOME && !MSWIN32
&& !MSWINCE) && !USE_SEGV_SIGACT] (old_segv_handler): Rename to
old_segv_hand.
* os_dep.c [(NEED_FIND_LIMIT || UNIX_LIKE || WRAP_MARK_SOME && !MSWIN32
&& !MSWINCE) && !USE_SEGV_SIGACT && HAVE_SIGBUS] (old_bus_handler):
Rename to old_bus_hand.
* os_dep.c [MPROTECT_VDB && !DARWIN]: Replace FREEBSD || HPUX || HURD
to USE_BUS_SIGACT.

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