[LLDB] - Fix setting the breakpoints when -gsplit-dwarf and DWARF 5 were used...

[LLDB] - Fix setting the breakpoints when -gsplit-dwarf and DWARF 5 were used for building the executable.

The issue happens because starting from DWARF v5
DW_AT_addr_base attribute should be used
instead of DW_AT_GNU_addr_base. LLDB does not do that and
we end up reading the .debug_addr header as section content
(as addresses) instead of skipping it and reading the real addresses.
Then LLDB is unable to match 2 similar locations and
thinks they are different.

Differential revision: https://reviews.llvm.org/D54751

llvm-svn: 347842