[llvm] [NFC][Sink] Change runtime checks to asserts (PR #137354)

[via llvm-commits]

LU-JOHN wrote:

> This is not an NFC when `assert` is disabled.

When assert is disabled I've removed an if-block where the condition can never be true.  Isn't this a NFC?




https://github.com/llvm/llvm-project/pull/137354