Prefix inc refactoring

compiler/testData/codegen/boxWithStdlib/lazyCodegen/increment.kt

@@ -0,0 +1,31 @@
+var holder = ""
+var globalA: A = A(-1)
+    get(): A {
+        holder += "getA"
+        return $globalA
+    }
+
+
+class A(val p: Int) {
+
+    var prop = this
+
+    fun inc(): A {
+        return A(p+1)
+    }
+
+
+}
+
+fun box(): String {
+    var a = A(1)
+    ++a
+    if (a.p != 2) return "fail 1: ${a.p} $holder"
+
+    globalA = A(1)
+    ++(globalA.prop)
+    val holderValue = holder;
+    if (globalA.p != 1 || globalA.prop.p != 2 || holderValue != "getA") return "fail 2: ${a.p} ${a.prop.p} ${holderValue}"
+
+    return "OK"
+}