swift

466d6a94 - RequirementMachine: Refactor shouldSplitConcreteEquivalenceClasses() and splitConcreteEquivalenceClasses() a bit

RequirementMachine: Refactor shouldSplitConcreteEquivalenceClasses() and splitConcreteEquivalenceClasses() a bit Note that this changes the behavior of a test slightly when the -disable-concrete-contraction flag is used. This is because we're not using the Requirement Machine that minimized the signature and not the Requirement Machine built from the minimized signature; the former includes a concrete conformance rule. The isConcreteType() query returns true on the former when given the generic parameter τ_0_0. Since -disable-concrete-contraction is only meant for debugging, I'm just removing that line from the test.