[clang] [CIR] max-across-vector (vmaxv_*) intrinsics (PR #194401)

[Kartik Ohlan via cfe-commits]

Ko496-glitch wrote:

@banach-space  fyi test cases are not ordered, if you want i can do that once you confirm the structure of test cases looks good :) 

https://github.com/llvm/llvm-project/pull/194401