[llvm] [Dwarf][Transforms] Add dwarf support when func signature changed (PR #127855)

[Paul T Robinson via llvm-commits]

pogo59 wrote:

DW_AT_artificial means "this entity is not represented explicitly in the source" which is kind of the opposite of what is actually going on--it's the inlined version that's artificial.
Also, this construct allows for only one inlined/modified version; if there are two different instances with two different signature modifications, there's no way to describe both of them.

Now, I could see flagging the DW_TAG_inlined_subroutine with DW_AT_artificial, and using the normal DW_AT_specification to point back to the DW_TAG_subprogram, but still providing the parameter details on the inlined_subroutine. Maybe this was already described above, and there's a reason not to do it that way, sorry I didn't go back and reread the entire thread.

https://github.com/llvm/llvm-project/pull/127855