Exclude GC tests from GCStress runs

[shimingsg]

this test failed when set TestGCStressLevel=2, error message in testresult.xml as following

1. test name="System.Tests.GCTests.LatencyRoundtrips_LowLatency(value: SustainedLowLatency)" type="System.Tests.GCTests" method="LatencyRoundtrips_LowLatency" time="0.2391149" result="Fail"
2. failure exception-type="Xunit.Sdk.EqualException"
3. Stacktrace:
   at System.Tests.GCTests.LatencyRoundtrips(GCLatencyMode value) in F:\repos\corefx\src\System.Runtime\tests\System\GCTests.cs:line 406
   at System.Tests.GCTests.LatencyRoundtrips_LowLatency(GCLatencyMode value) in F:\repos\corefx\src\System.Runtime\tests\System\GCTests.cs:line 419
4. testResults file attached:
   testResults.txt

[danmoseley]

      <test name="System.Tests.GCTests.LatencyRoundtrips_LowLatency(value: SustainedLowLatency)" type="System.Tests.GCTests" method="LatencyRoundtrips_LowLatency" time="0.2391149" result="Fail">
        <traits>
          <trait name="category" value="nonlinuxtests" />
          <trait name="category" value="nonosxtests" />
          <trait name="category" value="nonfreebsdtests" />
          <trait name="category" value="nonnetbsdtests" />
        </traits>
        <failure exception-type="Xunit.Sdk.EqualException">
          <message><![CDATA[Assert.Equal() Failure\r\nExpected: SustainedLowLatency\r\nActual:   Batch]]></message>
          <stack-trace><![CDATA[   at System.Tests.GCTests.LatencyRoundtrips(GCLatencyMode value) in F:\repos\corefx\src\System.Runtime\tests\System\GCTests.cs:line 406
   at System.Tests.GCTests.LatencyRoundtrips_LowLatency(GCLatencyMode value) in F:\repos\corefx\src\System.Runtime\tests\System\GCTests.cs:line 419]]></stack-trace>
        </failure>
      </test>

[danmoseley]

@swgillespie I'm guessing this test is expected to fail when gcstress is 2? If so is there some check we can do in the test so it doesn't? Worst case, check whether COMPLUS_GCStress is set, I guess.

[swgillespie]

@danmosemsft Yeah, i'd imagine that this test would fail if GCStress is inducing GCs. We don't have anything like this for CoreFX, do we?

[danmoseley]

We don't. Also that would assume they're in their own assembly. OK, I'll just ignore the error for now.

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