fix(IE): make shim work with instrumented code - #6944

This breaks some tests in IE10 and IE9: https://travis-ci.org/angular/angular/jobs/107675986
Can you fix please?

@Mlaval Sorry this took so long, the CI build failed last time for some unknown reason, and I've been busy at work. All green now.

👍 Please don't hold this fix back, since it's needed and does not depend on fixing the "bigger" issues that refers it.

Also, please include note in CHANGELOG so that people can remove their own workaround when upgrading angular.

I realize I have created a duplicate pull request (#7864). Sorry.

Anyway, I think the regex suggested in this PR is too restrictive. ECMAScript identifiers are not limited to basic ASCII characters: http://www.ecma-international.org/ecma-262/6.0/index.html#sec-identifier-names

The specification is kind of hard to read, but I tried creating a function in Google Chrome that looked like this function HallåDär() { console.log("Hej!"); } and it worked fine.

I suggest we use the simpler regex from my PR.

For me, this fixed the exception reported in #7632 as well, which ist still marked as open. But I am not sure, if this is generally the case.

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