Merge pull request kubernetes#5550 from DataDog/lt-overrides-and-inst…

…ancetyperequirements

AWS: only look for InstanceRequirements when needed

cluster-autoscaler/cloudprovider/aws/aws_manager.go

@@ -334,7 +334,7 @@ func joinNodeLabelsChoosingUserValuesOverAPIValues(extractedLabels map[string]st
 }
 
 func (m *AwsManager) updateCapacityWithRequirementsOverrides(capacity *apiv1.ResourceList, policy *mixedInstancesPolicy) error {
-	if policy == nil {
+	if policy == nil || len(policy.instanceTypesOverrides) > 0 {
 		return nil
 	}