[lldb] [llvm] [lldb][DWARF64] Enable support for DWARF64 format handling (PR #145645)

[Hemang Gadhavi via llvm-commits]

HemangGadhavi wrote:

> Assuming there is not a lot more work to be done for DWARF64, this needs a release note - https://github.com/llvm/llvm-project/blob/main/llvm/docs/ReleaseNotes.md#changes-to-lldb.
> 
> You can do that in this PR or a follow up.

Updated with this PR only, Please review once @DavidSpickett Thanks!

https://github.com/llvm/llvm-project/pull/145645