adjust watchpoint testing

[Nathan Sidwell]

Wu Zhou wrote:
> Nathan,
> 
> I had similar concerns about these watchpoint tests with you.  However, 
> I'd like to propose a somewhat different solution.

> This target-dependent feature might incur confusion some where.  One 
> may have difficulty in knowing for sure what this case is trying to 
> test: s/w watchpoint, or h/w watchpoint, or both?  If there are errors 
> reported, what type of watchpoint trigger that?  To track into the root 
> cause, which code to look at? 
> 
> To clarify the situation, I propose to let recurse.exp based on totally on 
> software simulated watchpoint.  This can be done easily, by using "set 
> can-use-hardware-watchpoint 0".

Thanks for your comments. Over the weekend, I had a thought that the problem is 
the remote stub not telling gdb how many watchpoints it can support.  I think 
this is a thing for qPacketInfo to deal with, and I can talk to Dan about that.

nathan
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