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/diagnostics/testsWithStdLib/duplicateJvmSignature/jvmOverloads.kt

@@ -0,0 +1,8 @@
+// !DIAGNOSTICS: -UNUSED_PARAMETER
+class <!CONFLICTING_JVM_DECLARATIONS!>A<!> {
+    [kotlin.jvm.overloads] fun foo(s: String = "") {
+    }
+
+    <!CONFLICTING_JVM_DECLARATIONS!>fun foo()<!> {
+    }
+}