Issue description

GroovyMock interactions for final class doesn't work inside@CompileStatic annotated class or in plain java class. In this case mock object will use real method implementation instead of provided interaction.

Minimal code to reproduce

import groovy.transform.CompileStatic
import spock.lang.Specification

class UserServiceSpec extends Specification {
    def "test final class mock interactions"() {
        setup:
            def mock = GroovyMock(FinalClass) {
                getName() >> "Foo Bar"
            }
        when:
            new StaticService().getName(mock)
        then:
            thrown(UnsupportedOperationException)
        expect:
            new GroovyService().getName(mock) == "FOO BAR"
    }
}

final class FinalClass {
    String getName() {
        throw new UnsupportedOperationException("Not implemented")    
    }
}

class GroovyService {
    String getName(FinalClass obj) {
        obj.name.toUpperCase()
    }
}

@CompileStatic
class StaticService {
    String getName(FinalClass obj) {
        obj.name.toUpperCase()
    }
}

Environment

Java: OpenJDK Runtime Environment (build 1.8.0_144-b01) Gradle: 3.5

Gradle dependencies

compile 'org.codehaus.groovy:groovy-all:2.4.12'
compile 'org.spockframework:spock-core:1.1-groovy-2.4'
compile 'cglib:cglib-nodep:3.2.5'