Fix evaluation order with object spread (#11412)

* Fix object spread runtime semantics

* limit this deoptimization

* optimize empty objects

* declare variables

packages/babel-plugin-proposal-object-rest-spread/test/fixtures/object-spread/side-effect/input.js

@@ -0,0 +1,16 @@
+var k = { a: 1, b: 2 };
+var o = { a: 3, ...k, b: k.a++ };
+
+var pureA = {};
+var pureB = {};
+var pureC = {};
+var pureD = {};
+var pureE = {};
+
+function impureFunc() {
+  console.log('hello')
+}
+
+var output = { ...pureA, get foo() {}, get bar() {}, ...pureB, ...pureC, ...impureFunc(), ...pureD, pureD }
+
+var simpleOutput = { ...pureA, test: '1', ...pureB,  }