[PATCH] D22900: Revert r244207 - Mark calls in thunk functions as tail-call optimization

[Reid Kleckner via cfe-commits]

rnk added a comment.

I think the correctness problem is in DSE. It should be safe for clang to put 'tail' here. The tail call does not capture the address of any local variables, but it does load from them via 'byval'.


https://reviews.llvm.org/D22900