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/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
+}