[Coroutines] Remove lifetime intrinsics for spliied allocas in coroutine frames

Closing https://github.com/llvm/llvm-project/issues/56919

It is meaningless to preserve the lifetime markers for the spilled
allocas in the coroutine frames and it would block some optimizations
too.

GitOrigin-RevId: 230d6f93aaabae985e9fafd071bb3737533c6083
2 files changed