Incorrect error for parameter properties references

[sandersn]

class Foo {
    constructor(public x = 12, public y = x.toFixed()) {}
}

Expected behavior:
No error.

Actual behavior:
Can't find name 'x' in the expression 'x.toFixed()'.

Caused by #26317, so the fix should be an easy modification to that new code.

[weswigham]

Reminder that target: es2015 needs to be set, too.

[RyanCavanaugh]

Paging @Kingwl 😉

[Kingwl]

sorry about that, i will take a look soon