Extremely high memory usage in DTH for Mvc.NoFun.sln

[rynowak]

I'm now regularly seeing memory usage climb to around 1.2gb in DTH on the smaller MVC solution (~30 projects). This makes VS slow to crawl and every operation feels extremely sluggish.

Using 1.0.0-beta7-12356

I can easily repro this, and it seems to occur most frequently when doing a build in VS resulting in compilation errors.

I have a memory dump available, here's what's using all of the memory and how it's rooted:

[rynowak]

/cc @troydai @davidfowl @BillHiebert

[troydai]

Similar issue happens in EF as well. Our allocation is intensive.

[analogrelay]

I'm taking a look at this. I'm not sure why my change would have caused it, but it seems connected :)

[analogrelay]

I've identified a potential leak, once I've got a repro I should be able to do a before/after comparison and have a fix out.