Add a syntax sugar for v-bind

[maple3142]

Version

2.4.2

Reproduction link

https://jsfiddle.net/Logqa8z5/

Steps to reproduce

Click run

What is expected?

no

What is actually happening?

no

---

I wish can make <myspan :text="text"></span> with shorter syntax like this <myspan :text></myspan>
When the prop name same as existing variable in parent, expand :text to :text="text"

[sqal]

It has been proposed many times in the past, please check #5835

[posva]

what @sqal said, dup of #5835