Commit [9772cd] Maximize Restore History

1.0.10.53: fix undefined-alien errors on darwin

* the new mach exception handling stuff was checking to see if there
were two faults on the page by checking the region's protection
status and bailing out assuming that there were two faults on the
same page. The problem was that it was following this code path for
undefined-alien errors (and presumably control-stack-exhausted)
thereby just resignalling an EXC_BAD_ACCESS, ad infinitum. Moved
the checks for the page address being undefined_alien_address, or
the control stack guard pages up before checking the page
protection.

Cyrus Harmon Cyrus Harmon 2007-10-21

changed src/runtime/x86-darwin-os.c
changed version.lisp-expr
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