[llvm] [HashRecognize] Tighten pre-conditions for analysis (PR #144757)

[Ramkumar Ramachandra via llvm-commits]

artagnon wrote:

> We need tests for these two new conditions.

I added two new tests, thanks.

> And for TC > 256.

This already exists as not.crc.tc.limit.

https://github.com/llvm/llvm-project/pull/144757