JVM_IR: optimize delegation by property references

E.g. a statement like

    var x by ::y

is semantically equivalent to

    var x
      get() = y
      set(value) { y = value }

and thus does not need a full property reference object, or even a field
if the receiver is not bound.

 #KT-39054 Fixed
 #KT-47102 Fixed

compiler/testData/codegen/bytecodeText/optimizedDelegatedProperties/delegateToAnother.kt

@@ -0,0 +1,38 @@
+// WITH_RUNTIME
+class C(var x: Int) {
+    val y by C::x
+    var ym by C::x
+    val z by ::x
+    var zm by ::x
+}
+
+class D(val c: C) {
+    val y by c::x
+    var ym by c::x
+    val C.z by C::x
+    var C.zm by C::x
+}
+
+var x = 1
+val y by ::x
+var ym by ::x
+val z by C(1)::x
+var zm by C(1)::x
+
+fun local() {
+    val y by ::x
+    var ym by ::x
+    val z by C(1)::x
+    var zm by C(1)::x
+}
+
+// 0 \$\$delegatedProperties
+// 0 kotlin/jvm/internal/PropertyReference[0-2]Impl\.\<init\>
+
+// JVM_IR_TEMPLATES
+// Optimized all to direct accesses:
+// 0 kotlin/jvm/internal/MutablePropertyReference[0-2]Impl\.\<init\>
+
+// JVM_TEMPLATES
+// Not optimized:
+// 16 kotlin/jvm/internal/MutablePropertyReference[0-2]Impl\.\<init\>