Implement adding null check for this call

[kyulee1]

This implements adding null check for this call utilizing the latest null check implementation.
Since this only applies to this argument, I moved the check inside the loop that builds arguments.

[kyulee1]

@JosephTremoulet PTAL

[pgavlin]

FYI, PR #201 also contains baseline adjustments. You should probably wait to merge until that PR is merged, then rebase your changes and generate new baselines for the tests.

[libengu]

@kyulee1 I think the reason your baseline does not pick up the latest CoreCLR assembly change is your CoreCLRTestAssets is out-dated. You probably need to delete your CoreCLRTestAssets directory and start a new session. And then you do what you need to do originally.

[kyulee1]

Should build system/framework check if it is out-dated and update it accordingly?

[JosephTremoulet]

Code changes look good to me.

[libengu]

@kyulee1 I think so. Will figure out whether there is a better way.

[libengu]

@kyulee1 This issue is different from getting a latest CoreCLR test assets. This problem is because CoreCLR upgraded some of the assembly they NuGet during buildtest. At this point, I have no way to detect this automatically. I will talk to CoreCLR side to see if we can do anything here.

[libengu]

@kyulee1 Please go ahead with your original commit. PR #201 build failed. It looks like lab does not see the new assembly change. Need to look deeper to see what caused this.