fix(compiler-core): properly rewrite identifier of for

[coderwei99]

I think #7245 should take into account the case of for loop

example:

<div @click = "() => {
	for(let i = 0; i < 10; i++){
		console.log(i,arr[i])
	}
}"/>

i think the for loop should compiler to:

	for (let i = 0; i < 10; i++) {
            _ctx.log(i,_ctx.arr[i])
    }

but now it is:

	for (let i = 0; _ctx.i < 10; _ctx.i++) {
      _ctx.log(_ctx.i,_ctx.arr[_ctx.i])
  	}

[edison1105]

I feel we should review the existing PR rather than open a new one.

[coderwei99]

@edison1105 Can you tell me what should I do? thank!