Factor the code that was eliminating redundant breakpoint locations and moving
line breakpoints past the prologue of functions so it can be shared between the
file & line breakpoint resolver, and the source pattern breakpoint resolver,
and then share it.


git-svn-id: https://llvm.org/svn/llvm-project/lldb/trunk@191478 91177308-0d34-0410-b5e6-96231b3b80d8