Implement kotlin.jvm.overloads annotation for generating all overloads of a method that has default parameter values.

#KT-2095 Fixed

fix backend-side issues with kotlin.jvm.overloads: support the annotation on constructors, generate nullablity annotations on parameters, generate generic signatures, add various tests

compiler/testData/codegen/boxWithJava/jvmOverloads/generics/Test.java

@@ -0,0 +1,6 @@
+public class Test {
+    public static String invokeMethodWithOverloads() {
+        C<String> c = new C<String>();
+        return c.foo("O");
+    }
+}

compiler/testData/codegen/boxWithJava/jvmOverloads/generics/generics.kt

@@ -0,0 +1,7 @@
+class C<T> {
+    [kotlin.jvm.overloads] public fun foo(o: T, k: String = "K"): String = o.toString() + k
+}
+
+fun box(): String {
+    return Test.invokeMethodWithOverloads()
+}

compiler/testData/codegen/boxWithJava/jvmOverloads/simple/Test.java

@@ -0,0 +1,6 @@
+public class Test {
+    public static String invokeMethodWithOverloads() {
+        C c = new C();
+        return c.foo();
+    }
+}

compiler/testData/codegen/boxWithJava/jvmOverloads/simple/simple.kt

@@ -0,0 +1,7 @@
+class C {
+    [kotlin.jvm.overloads] public fun foo(o: String = "O", k: String = "K"): String = o + k
+}
+
+fun box(): String {
+    return Test.invokeMethodWithOverloads()
+}

compiler/testData/codegen/boxWithStdlib/jvmOverloads/defaultsNotAtEnd.kt

@@ -0,0 +1,11 @@
+class C {
+    [kotlin.jvm.overloads] public fun foo(o: String = "O", i1: Int, k: String = "K", i2: Int): String {
+        return o + k
+    }
+}
+
+fun box(): String {
+    val c = C()
+    val m = c.javaClass.getMethod("foo", javaClass<Int>(), javaClass<Int>())
+    return m.invoke(c, 1, 2) as String
+}

compiler/testData/codegen/boxWithStdlib/jvmOverloads/primaryConstructor.kt

@@ -0,0 +1,8 @@
+class C [kotlin.jvm.overloads] (s1: String, s2: String = "K") {
+    public val status: String = s1 + s2
+}
+
+fun box(): String {
+    val c = (javaClass<C>().getConstructor(javaClass<String>()).newInstance("O"))
+    return c.status
+}

compiler/testData/codegen/boxWithStdlib/jvmOverloads/secondaryConstructor.kt

@@ -0,0 +1,12 @@
+class C(val i: Int) {
+    var status = "fail"
+
+    [kotlin.jvm.overloads] constructor(o: String, k: String = "K"): this(-1) {
+        status = o + k
+    }
+}
+
+fun box(): String {
+    val c = (javaClass<C>().getConstructor(javaClass<String>()).newInstance("O"))
+    return c.status
+}