[clang-tools-extra] [LLVM] Add IRNormalizer Pass (PR #68176)

[Michal Paszkowski via cfe-commits]

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@@ -543,6 +543,15 @@ variables with initializers are marked as internal.
 An interprocedural variant of :ref:`Sparse Conditional Constant Propagation
 <passes-sccp>`.
 
+``ir-normalizer``: Transforms IR into a canonical form that's easier to diff
+--------------------------------------------------------
+
+This pass aims to transform LLVM Modules into a canonical form by reordering and
+renaming instructions while preserving the same semantics. The canonicalizer makes
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michalpaszkowski wrote:

canonicalizer -> normalizer

https://github.com/llvm/llvm-project/pull/68176