Support bridges in interfaces. Fix for KT-12416: Missed bridges in js backend

#KT-12416 Fixed

compiler/testData/codegen/java8/box/jvm8/bridgeInClass.kt

@@ -0,0 +1,21 @@
+// KOTLIN_CONFIGURATION_FLAGS: +JVM.JVM_8_TARGET
+interface Test<T> {
+    fun test(p: T): T {
+        return p
+    }
+}
+
+class TestClass : Test<String> {
+    override fun test(p: String): String {
+        return p + "K"
+    }
+}
+
+fun <T> execute(t: Test<T>, p: T): T {
+    return t.test(p)
+}
+
+fun box(): String {
+    return execute(TestClass(), "O")
+}
+

compiler/testData/codegen/java8/box/jvm8/bridgeInInterface.kt

@@ -0,0 +1,24 @@
+// KOTLIN_CONFIGURATION_FLAGS: +JVM.JVM_8_TARGET
+interface Test<T> {
+    fun test(p: T): T {
+        return p
+    }
+}
+
+interface Test2: Test<String> {
+    override fun test(p: String): String {
+        return p + "K"
+    }
+}
+
+class TestClass : Test2 {
+}
+
+fun <T> execute(t: Test<T>, p: T): T {
+    return t.test(p)
+}
+
+fun box(): String {
+    return execute(TestClass(), "O")
+}
+