[llvm] [IA] Support deinterleave intrinsics w/ fewer than N extracts (PR #147572)

[Luke Lau via llvm-commits]

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@@ -698,7 +701,7 @@ bool InterleavedAccessImpl::lowerDeinterleaveIntrinsic(
 
     // Since lowerInterleaveLoad expects Shuffles and LoadInst, use special
     // TLI function to emit target-specific interleaved instruction.
-    if (!TLI->lowerInterleavedVPLoad(VPLoad, Mask, DeinterleaveValues))
+    if (!TLI->lowerInterleavedVPLoad(VPLoad, Mask, DeinterleaveValues, Factor))
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lukel97 wrote:

Should we just plumb through `LastFactor->getType()` to save TLIs from having to do find_if on the DeinterleaveValues each time?

https://github.com/llvm/llvm-project/pull/147572