Your change to can_use_hardware_watchpoint breaks hw wp

[H.J. Lu]

> 
> > Do you have access to a Linux/x86 machine? Could you please try
> > gdb 4.17.0.13 to see if it has the problems you tried to fix?
> 
> No, unfortunately.  If you can post the changes , I will try to use
> them on the platform that I can use for development and see if they
> solve the problems.
> 

My change is specific to Linux/x86. Since gdb has been working that
way on x86 for many years, I assumed I was the only person who wanted
to change it. I made my change limited only to Linux/x86 so that other
x86 platforms remain the same.

BTW, I can set hardware watchpoints on array element, struct member
and 4 long long, float, double or long double.

-- 
H.J. Lu (hjl@gnu.org)