Performance: TextMate allocates a lot of int[]'s

[ryanbrandenburg]

Recommendation from https://github.com/dotnet/aspnetcore/issues/30247.

While not directly related to Razor allocations anywhere in VS could delay us.

We noticed that in some large file cases TextMate.Core.parser.Implementation.ParserState.ctor allocated as much as 111MB of int[]'s. While some amount of allocations is unavoidable when parsing we might be able to work with them to reduce that amount down to something more managable.

[NTaylorMullen]

Just found a significant UI hang via TextMate. Filed a backing internal VS issue.

[NTaylorMullen]

@ryanbrandenburg does there happen to be a backing VSTS issue for the originally reported issue here?

[ryanbrandenburg]

https://devdiv.visualstudio.com/DevDiv/_workitems/edit/1390679