Emit tests are approaching the string limit

[RikkiGibson]

While bringing the features/param-nullchecking branch up to date, I found the following build error:

CSC : error CS8103: Combined length of user strings used by the program exceeds allowed limit. Try to decrease use of string literals. [C:\Users\rikki\src\roslyn\src\Compilers\CSharp\Test\Emit\Microsoft.CodeAnalysis.CSharp.Emit.UnitTests.csproj]

I think the 1400~ lines of emit tests in the feature branch pushed us over an edge. We probably need to factor another test project out of the current 'Emit' test project.

Any strategies/suggestions for how to do this split would be welcome. I will try soon to write up a script to count up the sizes of string constants in different source files. Maybe a logical split will become apparent then.

cc @dotnet/roslyn-compiler

[jaredpar]

Any strategies/suggestions for how to do this split would be welcome. I will try soon to write up a script to count up the sizes of string constants in different source files. Maybe a logical split will become apparent then.

I think this is the best approach here and I'm hopeful a logical split becomes apparent.

Do we know what the limit is here that we're working against? I forget the exact size here.

[RikkiGibson]

For now will just introduce an 'Emit2' project which new tests can go into.