Update to 6.6:

Since 6.5
 - Fix CPU count detection for Irix and FreeBSD. (Thanks to Dan Bonachea.)
 - Integrate Dan Bonachea's patch for the IBM XLC compiler on Darwin.
 - Integrated Andreas Tobler's FreeBSD/PowerPC patch.
 - Don't access the GC thread structure from the restart handler.  It's
   unsafe, since the handler may run too late.  (Thanks to Ben Maurer for
   tracking this down.)
 - Applied Christian Thalinger's patch to change comment syntax in
   alpha_mach_dep.S.
 - Added test for GC_no_dls in GC_dyld_image_add for DARWIN. (Thanks to
   Juan Jose Garcia Ripoli).
 - Use LINUX_STACKBOTTOM for Linux/SH and LINUX/ARM. (Thanks to Sugioka
   Toshinobu and Christian Thalinger.)
 - Rewrote GC_parse_map_entry.  This assumed a fixed column layout of
   /proc/self/maps on Linux.  This ceased to be true about 2 years ago.
   The old code is probably quite problemetic with -DREDIRECT_MALLOC.  It
   is also used by default for IA64, though I haven't seen actual failures
   there.
 - More consistently define HBLKSIZE to 4096 on 64 bit architectures with
   4K pages.  (Thanks to Andrew Haley.)
 - With win32 threads, GC_stop_world needs to acquire GC_write_cs.  (Thanks
   to Ben Hutchings for the observation and patch.)
 - Move up struct callinfo declaration to make gcc 4.0.2. happy.

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