[llvm] [AllocToken] Fix attribute mismatch in AllocTokenPass (PR #174959)

[Ayumi OHNO via llvm-commits]

ayumiohno wrote:

> Change LGTM, but are you able to create a small test case for this?

I tried, but I could not.
In my understanding, it will reproduce in the following conditions:
1. `_Znwm` callee already exists before LowerTypeTestsPass with correct function type, while `__alloc_token_0__Znwm` does not.
2. In the LowerTypeTestsPass, `__alloc_token_0__Znwm` is considered as `ExportedFunctions`. (then created as void).
3. In the AllocTokenPass, `__alloc_token_0__Znwm` call is inserted.
4. VerifyPass runs.


https://github.com/llvm/llvm-project/pull/174959