[llvm] [LoopIdiomRecognize] Enable clmul optimization for CRC loops (PR #203405)

[Piotr Fusik via llvm-commits]

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@@ -376,6 +376,72 @@ CRCTable HashRecognize::genSarwateTable(const APInt &GenPoly,
   return Table;
 }
 
+// Perform polynomial (GF(2)) floor division. This is based on the
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pfusik wrote:

The existing functions in this file have `///` doc comments. Make it consistent.

https://github.com/llvm/llvm-project/pull/203405