IE/Edge missing in compat data

[kroofy]

While browsing thru https://github.com/zloirock/core-js/blob/master/packages/core-js-compat/src/data.js

I noticed that es.string.search (browser compat) and es.string.replace among others are missing IE and Edge versions. Is this intentional or would it be welcomed by the project to have a PR submitted to add compat data for IE and Edge related polyfills? I would be happy to help it that's the case.

[davidmerrique]

I also noticed that Edge is missing from a few other things, such as es.promise, es.object.assign (https://kangax.github.io/compat-table/es6/#test-Promise)

[slowcheetah]

@kroofy by modern standards, es.string.replace & es.string.search should refer to well-known symbols. IE deviates from these standards and some others. Therefore, these methods should be polyfilled.

@davidmerrique see #761