[llvm] [GlobalISel] Allow customizing instruction-select pass (PR #95724)

[via llvm-commits]

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@@ -49,8 +49,8 @@ class InstructionSelect : public MachineFunctionPass {
         MachineFunctionProperties::Property::Selected);
   }
 
-  InstructionSelect(CodeGenOptLevel OL);
-  InstructionSelect();
+  InstructionSelect(CodeGenOptLevel OL = CodeGenOptLevel::Default,
+                    char &PassID = ID);
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darkbuck wrote:

That allows us to customize that instruction select pass by adding extra analysis dependencies. The target could add a subclass from this `InstructionSelect` pass and specify additional analysis dependencies to be used during instruction selection.

https://github.com/llvm/llvm-project/pull/95724