this service will update solution checksum incrementally whenever workspace is changed.

This reverts commit cf879739, reversing
changes made to 62b4751b.

This reverts commit 7357c7ba.

found a bug where we missed caching a project explicitly while doing document analysis.

this is a race so it doesn't happen all the time, but when condition is met, we will re-parse every files in the project to build compilation for every file in the project.

I am not 100% sure since when this bug exists but looks like some recent change caused this to happen more often.

I hope this is the reason for VM increase in some of our perf tests.

found a bug where we missed caching a project explicitly while doing document analysis.

this is a race so it doesn't happen all the time, but when condition is met, we will re-parse every files in the project to build compilation for every file in the project.

I am not 100% sure since when this bug exists but looks like some recent change caused this to happen more often.

I hope this is the reason for VM increase in some of our perf tests.

first, made solution crawler options to show up in Roslyn/Option pane to make experiement easier.
second, tweaked the way higher/normal/low priority processor interact each other.
last, made solution crawler to pick next project to process a bit smarter.

misc.
fixed an issue where lazyLogmessage didn't clear cached message correctly
changed etw logging default to not log at all

threshold to turn on esent is 50MB > solution source size. esent will be turned on dynamically, once turned on, it will turned off again when solution is closed.

this PR addresses #910

previously on global operation, soluton crawler will pause itself but it won't cancel already running tasks.

this change make solution crawler to even cancel running tasks and go to pause mode sooner on global operation.

cancelled tasks will re-enqueued to work queue and will run next time.

first working version. need some more tweaks.

this is first step to add that support. added solution crawler progress reporter and renamed some types to solution crawler. and some plumbing to pass around progress reporter

first working version. need some more tweaks.

this is first step to add that support. added solution crawler progress reporter and renamed some types to solution crawler. and some plumbing to pass around progress reporter

     Background:

     As discussed in the dev team all hands all code under the GitHub dotnet foundation is using a single process for contribution, API review, infrastructure and coding style. The idea is to present a unified view to our customer and give them a single story for contributing to any project under the dotnet foundation.

     https://github.com/dotnet/corefx/wiki/Contributing#c-coding-style

     The coding style transition is automated using a Roslyn based rewrite tool:

     https://github.com/dotnet/codeformatter

     This will be applied in stages across our developer tree. Right now the focus is on the Open directory as this is what is being presented on github. Code owners will be contacted before the transition happens.

     Note: this is a soft style requirement. There are no build errors that come from this change.
 (changeset 1408227)