init_breakpoint_sal -> base_breakpoint::base_breakpoint

init_breakpoint_sal -> base_breakpoint::base_breakpoint

This converts init_breakpoint_sal to a base_breakpoint constructor.

It removes a use of init_raw_breakpoint.

To avoid manually adding a bunch of parameters to
new_breakpoint_from_type, and manually passing them down to the
constructors of a number of different base_breakpoint subclasses, make
new_breakpoint_from_type a variable template function.

Change-Id: I4cc24133ac4c292f547289ec782fc78e5bbe2510