New default checks for mixed hierarchies

Old and new schemes

compiler/testData/compileKotlinAgainstCustomBinaries/jvmDefaultClashWithOld/library/a.kt

@@ -0,0 +1,13 @@
+package base
+
+interface Check {
+    fun test(): String {
+        return "fail";
+    }
+
+    var test: String
+        get() = "123"
+        set(value) { value.length}
+}
+
+open class CheckClass : Check

compiler/testData/compileKotlinAgainstCustomBinaries/jvmDefaultClashWithOld/output.txt

@@ -0,0 +1,7 @@
+compiler/testData/compileKotlinAgainstCustomBinaries/jvmDefaultClashWithOld/source.kt:15:7: error: explicit override is required for 'public open var test: String defined in SubCheckClass' in the '-Xjvm-default=all' mode. Otherwise, implicit class override 'public open var test: String defined in base.CheckClass' (compiled in the old -Xjvm-default mode) is not fully overridden and might be incorrectly called at runtime
+class SubCheckClass : CheckClass(), SubCheck
+      ^
+compiler/testData/compileKotlinAgainstCustomBinaries/jvmDefaultClashWithOld/source.kt:15:7: error: explicit override is required for 'public open fun test(): String defined in SubCheckClass' in the '-Xjvm-default=all' mode. Otherwise, implicit class override 'public open fun test(): String defined in base.CheckClass' (compiled in the old -Xjvm-default mode) is not fully overridden and might be incorrectly called at runtime
+class SubCheckClass : CheckClass(), SubCheck
+      ^
+COMPILATION_ERROR

compiler/testData/compileKotlinAgainstCustomBinaries/jvmDefaultClashWithOld/source.kt

@@ -0,0 +1,15 @@
+import base.*
+
+interface SubCheck : Check {
+    override fun test(): String {
+        return "OK"
+    }
+
+    override var test: String
+        get() = "OK"
+        set(value) {
+            value.length
+        }
+}
+
+class SubCheckClass : CheckClass(), SubCheck

compiler/testData/compileKotlinAgainstKotlin/jvm8/defaults/interop/likeMemberClash.kt

@@ -0,0 +1,26 @@
+// FULL_JDK
+// FILE: 1.kt
+// !JVM_DEFAULT_MODE: disable
+interface Check {
+    fun test(): String {
+        return "fail";
+    }
+}
+
+interface SubCheck : Check {
+    override fun test(): String {
+        return "OK"
+    }
+}
+
+
+open class CheckClass : Check
+
+// FILE: main.kt
+// !JVM_DEFAULT_MODE: all
+// JVM_TARGET: 1.8
+class SubCheckClass : CheckClass(), SubCheck
+
+fun box(): String {
+    return SubCheckClass().test()
+}

compiler/testData/compileKotlinAgainstKotlin/jvm8/defaults/interop/likeSpecialization.kt

@@ -0,0 +1,21 @@
+// WITH_RUNTIME
+// JVM_TARGET: 1.8
+// FILE: 1.kt
+// !JVM_DEFAULT_MODE: disable
+
+interface Foo<T> {
+    fun test(p: T) = p
+    val T.prop: String
+        get() = "K"
+}
+
+interface FooDerived: Foo<String>
+
+// FILE: main.kt
+// !JVM_DEFAULT_MODE: all-compatibility
+open class UnspecializedFromDerived : FooDerived
+
+fun box(): String {
+    val foo = UnspecializedFromDerived()
+    return foo.test("O") + with(foo) { "K".prop }
+}