[rfc] 16 bit real-mode for the i386

[Andrew Cagney]

Hello,

The attached modifies i386-tdep.c so that there is a ``set i386 
real-mode'' command (doco to go).

When real-mode is enabled, GDB computes the ``20 bit'' ``stop address'' 
(aka PC but not to be confused with $pc ... :-) from both the $cs and 
$pc registers.  That way, core GDB sees a cannonical PC address that 
(regardless of $cs) will match a ``20 bit'' breakpoint address.

Thoughts?

I'm desperatly trying to come up with a test-case mind.  This is a 
rewrite of an old old patch (that hacked breakpoint.c) and the original 
testcase has been lost :-(

Andrew
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