[llvm] [DebugInfo][SelectionDAG] Fix position of salvaged 'dangling' DBG_VALUEs (PR #94458)

[via llvm-commits]

asmok-g wrote:

Hi,

At google we see some increases of ~1.5% in DWP file sizes of some targets due to this change. Also, running `dwarfdump` on the files shows an increase of 1-2% in `vars_params_with_binary_location`. Is this expected from this patch ?

https://github.com/llvm/llvm-project/pull/94458