[llvm] [GlobalIsel] Visit ICmp (PR #105991)

[Thorsten Schütt via llvm-commits]

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@@ -1884,6 +1881,28 @@ def cast_combines: GICombineGroup<[
   buildvector_of_truncate
 ]>;
 
+def visit_icmp : GICombineRule<
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tschuett wrote:

We cannot express constant build vectors in MIR currently and visitFCmp would rely on `computeKnownFPClass`, which is more work.

https://github.com/llvm/llvm-project/pull/105991