[rfc;rfa:breakpoint] Pass full breakpoint/watchpoint count to target

[Andrew Cagney]

Hello,

The attached patch changes the target vector so that a count of each 
type of hardware watchpoint/breakpoint is passed to the 
target_can_use_hardware_breakpoints() function. (Anyone got a better 
name for the function?).

This lets targets make a better guess at how many watchpoints are going 
to be needed.  The intent is for the Z? packet to pass these totals down 
to the target.

Thoughts?

Is the breakpoint side ok?

(I need to find more hw with breakpoints to test against.)
Andrew

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