Support jvm default methods in IR

Fix several bugs around DefaultImpls

compiler/testData/codegen/box/jvm8/defaults/defaultArgsViaAnonymousObject.kt

@@ -0,0 +1,17 @@
+// !JVM_DEFAULT_MODE: enable
+// IGNORE_BACKEND_FIR: JVM_IR
+// TARGET_BACKEND: JVM
+// JVM_TARGET: 1.8
+// WITH_RUNTIME
+
+interface A {
+    @JvmDefault
+    fun foo(x: String = "OK"): String {
+        return x
+    }
+}
+
+fun box(): String {
+    val x = object : A {}
+    return x.foo()
+}