hoist an assert for InvalidInverseSubject

Author: kavon

lib/AST/RequirementMachine/Diagnostics.cpp

@@ -109,11 +109,12 @@ bool swift::rewriting::diagnoseRequirementErrors(
       if (error.requirement.hasError())
         break;
 
+      assert(error.requirement.getKind() == RequirementKind::Conformance);
+
       auto subjectType = error.requirement.getFirstType();
       auto constraintType = error.requirement.getSecondType();
 
       assert(constraintType->is<InverseType>());
-      assert(error.requirement.getKind() == RequirementKind::Conformance);
 
       ctx.Diags.diagnose(loc, diag::requires_not_suitable_inverse_subject,
                          subjectType, constraintType);