[llvm] [VPlan] Use frozen combined condition in early exit first-active-lane (PR #223643)

[Luke Lau via llvm-commits]

lukel97 wrote:

Ok fixed now in https://github.com/llvm/llvm-project/pull/226521. Had to write the patch in the GitHub.com web editor!

https://github.com/llvm/llvm-project/pull/223643