Improve CoreCLR test runner outside Windows

CoreCLR tests will need to be built on Windows and copied over to a non-Windows machine. Then, coreclr/tests/runtest.sh along
with some switches can be used to run the tests.

Changes:
- Run tests in parallel by default (use --sequential to force sequential mode)
- Update Windows test build to produce the Windows core overlay that includes test dependencies that are not built
- Add a number of switches (see coreclr/tests/runtest.sh for details) to provide locations of:
  - The Windows test build
  - The CoreCLR native test build
  - Either:
    - This:
      - The core layout (including all of the below)
    - Or:
      - The CoreCLR build
      - mscorlib.dll
      - The CoreFX build
      - The CoreFX native build
- Using information from above, build or use the core layout, and copy native test binaries to the respective test directories
- Add --testDir to specify an inclusive list of test directories to run
- Add text files to exclude tests:
  - coreclr/tests/testsUnsupportedOutsideWindows.txt - Tests that are not supported outside Windows
  - coreclr/tests/testsFailingOutsideWindows.txt - Tests that are known to fail outside Windows and are temporarily disabled while they are investigated
- Add --runFailingTestsOnly to run only the tests listed in coreclr/tests/testsFailingOutsideWindows.txt to verify known failures
- Produce xUnit-style output for the CI, output goes into <Windows test build folder>/coreclrtests.xml

1 files changed, 2 insertions, 2 deletions

diff --git a/tests/src/managed/Compilation/Compilation.cs b/tests/src/managed/Compilation/Compilation.cs
index 0a0037af29..9b3ebcdd90 100644
--- a/tests/src/managed/Compilation/Compilation.cs
+++ b/tests/src/managed/Compilation/Compilation.cs
@@ -14,11 +14,11 @@ class Program
     static int Main(string[] args)
     {
         Console.WriteLine("Starting the test");
-        string codeFile = @"helloWorld.cs";
+        string codeFile = @"HelloWorld.cs";
 
         var sourceTree = new List<SyntaxTree>(){SyntaxFactory.ParseSyntaxTree(File.ReadAllText(codeFile))};
 
-        string mscorlibFile = Path.Combine(Environment.GetEnvironmentVariable("Core_root"), "mscorlib.dll");
+        string mscorlibFile = Path.Combine(Environment.GetEnvironmentVariable("CORE_ROOT"), "mscorlib.dll");
         Console.WriteLine("Using reference to: {0}", mscorlibFile);
         var reference = new List<MetadataReference>(){ MetadataReference.CreateFromFile(mscorlibFile)};