Probably also make sense to update https://github.com/KhronosGroup/SPIRV-LLVM-Translator/blob/main/test/transcoding/annotation_dbg_info_drop.ll while we are here

Nice catch; I wondered why that test didn't fail, turns out it was XFAILed:

; need to rewrite the entire test since with opaque pointers a lot of bitcasts
; are being eliminated, and those bitcasts were carrying debug information
; XFAIL: *

Perhaps it's time to remove this test, given that debug info intrinsics are being retired; or do you think the original problem covered by this test may still occur with the new debug info record infrastructure?

@svenvh oh, I haven't noticed, that it's XFAILed. Let me cover this later.