JvmDefault. Allow non default inheritance with special flag

#KT-47000

compiler/testData/codegen/box/jvm8/defaults/nonDefaultInheritance/simple.kt

@@ -0,0 +1,57 @@
+// TARGET_BACKEND: JVM
+// IGNORE_BACKEND_FIR: JVM_IR
+// FULL_JDK
+// JVM_TARGET: 1.8
+// WITH_RUNTIME
+// MODULE: lib
+// !JVM_DEFAULT_MODE: all
+// FILE: Foo.kt
+
+interface Foo {
+    fun toOverride(): String = "fail"
+    
+    fun nonOverride(): String = "K"
+}
+
+// MODULE: main(lib)
+// !JVM_DEFAULT_MODE: disable
+// !JVM_DEFAULT_ALLOW_NON_DEFAULT_INHERITANCE
+// FILE: main.kt
+
+interface Derived : Foo {
+    override fun toOverride(): String {
+        return "O"
+    }
+}
+
+class DerivedClass : Derived 
+
+
+fun box(): String {
+    checkMethodExists(DerivedClass::class.java, "toOverride")
+    checkNoMethod(DerivedClass::class.java, "nonOverride")
+
+    val value = DerivedClass()
+    return value.toOverride() + value.nonOverride()
+}
+
+fun checkNoMethod(clazz: Class<*>, name: String, vararg parameterTypes: Class<*>) {
+    try {
+        clazz.getDeclaredMethod(name, *parameterTypes)
+    }
+    catch (e: NoSuchMethodException) {
+        return
+    }
+    throw AssertionError("fail: method $name was found in " + clazz)
+}
+
+fun checkMethodExists(clazz: Class<*>, name: String, vararg parameterTypes: Class<*>) {
+    try {
+        clazz.getDeclaredMethod(name, *parameterTypes)
+        return
+    }
+    catch (e: NoSuchMethodException) {
+        throw AssertionError("fail: method $name was not found in " + clazz, e)
+    }
+
+}