[Simh] pdp11 ash and ashc -32 handling

[Nelson H. F. Beebe]

"Walter F.J. Mueller" <W.F.J.Mueller at gsi.de> asks about the background
of the handling of the PDP-11 arithmetic shift instructions with
negative bit counts.

See
	Bob Supnik
	The Case of the Missing PLA Term, or, Microcode Bugs I Have Known
	http://simh.trailing-edge.com/docs/ucode_bugs.pdf

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