[patch] registers beginning with '$'

[Nathan Sidwell]

Hi,
I had the misfortune to port to an architecture where register names
all start with a '$' and the pc reg is '$PC'.  This patch fixes expression
printing of registers so that such names don't result in '$$name' being
printed.  It fixes register name lookup so that the leading '$' need not
be specified (several places strip leading '$' on the name to be looked
up).  It also makes the register name lookup case insensitive.

I also attach testsuite patches to allow $pc or $PC as the pc name.

built and tested on i686-pc-linux-gnu, and an unreleased architecture, ok?

nathan
-- 
Nathan Sidwell    ::   http://www.codesourcery.com   ::     CodeSourcery LLC
nathan@codesourcery.com    ::     http://www.planetfall.pwp.blueyonder.co.uk

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