Fix and refactor ExpressionCodegen#pushClosureOnStack

- change Closure parameter to ClassDescriptor, load closure in the beginning
- invert and rename boolean parameter, also use it only to prevent pushing
  dispatch receiver (not the extension receiver) onto the stack because the
  only non-trivial usage of it is preceded by manual handling of the dispatch
  (not extension) receiver. This fixes innerOfLocalCaptureExtensionReceiver.kt

compiler/testData/codegen/box/localClasses/innerOfLocalCaptureExtensionReceiver.kt

@@ -0,0 +1,15 @@
+fun String.bar(): String {
+    open class Local {
+        fun result() = this@bar
+    }
+
+    class Outer {
+        inner class Inner : Local() {
+            fun outer() = this@Outer
+        }
+    }
+
+    return Outer().Inner().result()
+}
+
+fun box() = "OK".bar()