Assign another temp var when parsing assignment patterns in destructuring (#7333)

packages/babel-plugin-transform-destructuring/test/fixtures/destructuring/const/exec.js

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+const getState = () => ({});
+
+const { data: { courses: oldCourses = [] } = {} } = getState();
+
+assert.deepEqual(oldCourses, []);

packages/babel-plugin-transform-destructuring/test/fixtures/destructuring/const/input.js

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+const { data: { courses: oldCourses = [] } = {} } = getState();

packages/babel-plugin-transform-destructuring/test/fixtures/destructuring/const/options.json

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+{
+  "plugins": ["transform-destructuring"]
+}

packages/babel-plugin-transform-destructuring/test/fixtures/destructuring/const/output.js

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+const _getState = getState(),
+      _getState$data = _getState.data,
+      _getState$data2 = _getState$data === void 0 ? {} : _getState$data,
+      _getState$data2$cours = _getState$data2.courses,
+      oldCourses = _getState$data2$cours === void 0 ? [] : _getState$data2$cours;