[llvm] [Inline] Accumulate the cost of the inlined function to the new callsite (PR #111104)

[Nikita Popov via llvm-commits]

nikic wrote:

Unfortunately, it looks like this patch is insufficient to fix https://github.com/llvm/llvm-project/issues/181821. It works neither for the reduced nor the full test case.

Here are some numbers on the resulting file size after running `opt -S -O3 main.ll`:

No patch: 9.5M
`/ 16`: 9.5M
`/ 8`: 5.0M
`/ 4`: 834K
`/ 2`: 279K
https://github.com/llvm/llvm-project/pull/181827: 25K

https://github.com/llvm/llvm-project/pull/111104