polish: print friendly error when hoisting unsupported node types

[JLHwung]

Context: babel/babel#10808

Transform the following snippet with only regenerator-transform

async (req) => {
  const { params } = req;
}

will throw

TypeError: /src.js: Property name expected type of string but got null
    at validate (/node_modules/@babel/types/lib/definitions/utils.js:164:13)
    at Object.validate (/node_modules/@babel/types/lib/definitions/utils.js:201:7)
    at validateField (node_modules/@babel/types/lib/validators/validate.js:22:9)
    at validate (/node_modules/@babel/types/lib/validators/validate.js:16:3)
    at builder (/node_modules/@babel/types/lib/builders/builder.js:38:27)
    at Object.Identifier (/node_modules/@babel/types/lib/builders/generated/index.js:334:31)
    at /node_modules/regenerator-transform/lib/hoist.js:32:29

Since practically every engine with native destructuring support will also have native generator support (thread). I think the value of pattern support is marginal. Hence we throw a better error.

[monsonjeremy]

🙌

[jeremytenjo]

How is this error fixed?

I get the error with the following code

const hello = async () => {
  const he = { ll: '2' }
  const { ll } = he
}

More info here #391

Thanks @JLHwung

[monsonjeremy]

Any chance we can get this merged?