[llvm] [VectorCombine] Add foldShuffleOfIntrinsics. (PR #106502)

[Simon Pilgrim via llvm-commits]

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+; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
+; RUN: opt -passes=vector-combine -S %s | FileCheck %s
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RKSimon wrote:

You're running tests for a fold that uses a cost function comparison without a triple / cpu target?

https://github.com/llvm/llvm-project/pull/106502