Support mapping between Kotlin functions and JVM methods/constructors

compiler/testData/codegen/boxWithStdlib/reflection/mapping/constructor.kt

@@ -0,0 +1,35 @@
+import kotlin.reflect.*
+import kotlin.reflect.jvm.*
+
+class K {
+    class Nested
+    inner class Inner
+}
+
+class Secondary {
+    constructor(x: Int) {}
+}
+
+fun check(f: KFunction<*>) {
+    assert(f.javaMethod == null, "Fail f method")
+    assert(f.javaConstructor != null, "Fail f constructor")
+    val c = f.javaConstructor!!
+
+    assert(c.kotlinFunction != null, "Fail m function")
+    val ff = c.kotlinFunction!!
+
+    assert(f == ff, "Fail f != ff")
+}
+
+fun box(): String {
+    check(::K)
+
+    // Workaround KT-8596
+    val nested = K::Nested
+    check(nested)
+
+    check(K::Inner)
+    check(::Secondary)
+
+    return "OK"
+}