[llvm] [ConstantFolding] Add folding for [de]interleave2, insert and extract (PR #141301)

[Craig Topper via llvm-commits]

================
@@ -0,0 +1,90 @@
+; NOTE: Assertions have been autogenerated by utils/update_test_checks.py UTC_ARGS: --version 5
+; RUN: opt < %s -passes=instsimplify,verify -disable-verify -S | FileCheck %s
----------------
topperc wrote:

If the verifier won't accept it does that mean the IR is actually malformed and not allowed?

https://github.com/llvm/llvm-project/pull/141301