[Clang][CodeGen] Emit fake uses before musttail calls (#136867)

Fixes the issue reported following the merge of #118026.

When a valid `musttail` call is made, the function it is made from must
return immediately after the call; if there are any cleanups left in the
function, then an error is triggered. This is not necessary for fake
uses however - it is perfectly valid to simply emit the fake use
"cleanup" code before the tail call, and indeed LLVM will automatically
move any fake uses following a tail call to come before the tail call.

Therefore, this patch specifically choose to handle fake use cleanups
when a musttail call is present by simply emitting them immediately
before the call.

0 files changed, 0 insertions, 0 deletions