Fix KFunction.javaMethod for property accessors

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

@@ -0,0 +1,34 @@
+import kotlin.reflect.jvm.*
+import kotlin.test.*
+
+var foo = "foo"
+
+class A {
+    var bar = "bar"
+}
+
+fun box(): String {
+    val fooGetter = ::foo.getter.javaMethod ?: return "Fail fooGetter"
+    assertEquals("foo", fooGetter.invoke(null))
+
+    val fooSetter = ::foo.setter.javaMethod ?: return "Fail fooSetter"
+    fooSetter.invoke(null, "foof")
+    assertEquals("foof", foo)
+
+    assertNull(::foo.getter.javaConstructor)
+    assertNull(::foo.setter.javaConstructor)
+
+
+    val a = A()
+    val barGetter = A::bar.getter.javaMethod ?: return "Fail barGetter"
+    assertEquals("bar", barGetter.invoke(a))
+
+    val barSetter = A::bar.setter.javaMethod ?: return "Fail barSetter"
+    barSetter.invoke(a, "barb")
+    assertEquals("barb", a.bar)
+
+    assertNull(A::bar.getter.javaConstructor)
+    assertNull(A::bar.setter.javaConstructor)
+
+    return "OK"
+}