This patch improves the error reporting for SBBreakpoint::AddName by
adding a new method SBBreakpoint::AddNameWithErrorHandling that returns
a SBError instead of a boolean.
This way, if the breakpoint naming failed in the backend, the client
(i.e. Xcode), will be able to report the reason of that failure to the
Signed-off-by: Med Ismail Bennani <email@example.com>