Rework how the breakpoint conditions & callbacks are handled. We now iterate...

Rework how the breakpoint conditions & callbacks are handled.  We now iterate over all the locations at the site
that got hit, and first check the condition, and if that location's condition says we should stop, then we
run the callback.  In the end if any location's condition and callback say we should stop, then we stop. 

llvm-svn: 146242