[turbofan] Factor out the function specific part from the frame state operator.

test/unittests/compiler/instruction-selector-unittest.h

Index: test/unittests/compiler/instruction-selector-unittest.h
diff --git a/test/unittests/compiler/instruction-selector-unittest.h b/test/unittests/compiler/instruction-selector-unittest.h
index 9ee04d70fe6fa75ff4842dfa3ca8e59e0e1c54ad..9ba513bfa82528b34e05b9d6c4ca60ed457ca0c7 100644
--- a/test/unittests/compiler/instruction-selector-unittest.h
+++ b/test/unittests/compiler/instruction-selector-unittest.h
@@ -77,6 +77,9 @@ class InstructionSelectorTest : public TestWithContext,
                  InstructionSelector::SourcePositionMode source_position_mode =
                      InstructionSelector::kAllSourcePositions);
 
+    const FrameStateFunctionInfo* GetFrameStateFunctionInfo(int parameter_count,
+                                                            int local_count);
+
    private:
     MachineSignature* MakeMachineSignature(Zone* zone,
                                            MachineType return_type) {