Needed for microsoft/vscode#18205

TypeScript Version: 2.2.0-dev.20170104

class Foo {
    public abc;
}

var foo = new Foo()
foo.abc = 10

I'm trying to execute a references request against the TSServer for the property abc. Currently, this only works if the target location is somewhere within the string abc. I believe the references command should work if the target location is anywhere inside of public abc instead.

This blocks adopting a references code lens provider in VSCode. The problem is that when determining which symbols in the document we want to have show reference counts for, the navtree request for the document returns abc with the entire public abc span. This span does not work with the references request that we later fire off.