[llvm] [IA] Fix crash when dealing with deinterleave(interleave) (PR #150713)

[Philip Reames via llvm-commits]

preames wrote:

I went ahead and pushed a direct fix for this in f65b329.  I used your test case, and added a couple others.

Looking at the change, I think this could become a reasonable cleanup.  I'd be tempted to fold the getMaskOperand into getMask (by replacing the mask operand with the LD/ST intrinsic).  If we did that, we could reuse the existing exit paths for unsupported intrinsics.  Do you want to reframe this patch to do that, or would you like me to follow up?

p.s. Sorry for the breakage.  In a case like this, feel free to drop a comment on the original review or file an issue.  I generally try to jump on such oversights pretty quickly. 

https://github.com/llvm/llvm-project/pull/150713