JVM IR: change generation scheme of property $delegate methods

Generate $delegate method as instance method in
PropertyReferenceDelegationLowering, and remove dispatch receiver later
in MakePropertyDelegateMethodsStatic. The method needs to be static to
be non-overridable (see delegateMethodIsNonOverridable.kt), and public
to be accessible in reflection.

Otherwise we generated incorrect IR where a static function accessed an
instance field of the containing class, which failed in multiple places
including LocalDeclarationsLowering.

 #KT-48350 Fixed

compiler/testData/codegen/bytecodeListing/delegatedProperty/delegateMethodIsNonOverridable.kt

@@ -0,0 +1,14 @@
+// WITH_RUNTIME
+
+val a = 1
+val b = 2
+
+open class C {
+    open val x by run { ::a }
+    open val y by ::a
+}
+
+class D : C() {
+    override val x by run { ::b }
+    override val y by ::b
+}