o  Fix cut-n-paste whitespace corruption in previous commit o  For trap-based upcalls the argument (the kse_mailbox) to    the UTS must be written onto the kernel stack, not the    user stack. While here, deal with the fact that we may    be at a NaT collection point.
o  Fix cut-n-paste whitespace corruption in previous commit
o  For trap-based upcalls the argument (the kse_mailbox) to
   the UTS must be written onto the kernel stack, not the
   user stack. While here, deal with the fact that we may
   be at a NaT collection point.

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