[llvm] [llvm][DebugInfo] Encode DW_AT_object_pointer on method declarations with DW_FORM_implicit_const (PR #124790)

[Jeremy Morse via llvm-commits]

jmorse wrote:

This is now on my radar and I've prodded our debugger folks; as far as I'm aware we don't make use of this information and feel it's fine behind a tuning flag.

I'm not familiar with how off-piste from the spec LLVM has gone in the past; if we use this representation (DW_FORM_implicit_const with variable index) are we shutting down any future design space that the standard might take, due to the need for backwards compatibility? Independent of that, it seems a pretty reasonable workaround.

https://github.com/llvm/llvm-project/pull/124790