RFC: fix stack height checks for agent expressions

[Jim Blandy]

I'll commit in a bit if nobody has further thoughts.

gdb/ChangeLog:
2005-11-18  Jim Blandy  <jimb@redhat.com>

	* ax-general.c (ax_reqs): If the jump target is marked as an
	instruction boundary, we have a stack height we can check there,
	too.
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