Remove IsolationLevel on test_dictcomp and test_setcomp (#1084)

Author: slozier

Src/IronPythonTest/Cases/IronPythonCasesManifest.ini

@@ -24,9 +24,6 @@ Reason=disabled in IronLanguages/main, needs lots of work
 [IronPython.test_delegate]
 RetryCount=2
 
-[IronPython.test_dictcomp]
-IsolationLevel=PROCESS # https://github.com/IronLanguages/ironpython3/issues/489
-
 [IronPython.test_doc]
 RunCondition=NOT $(IS_OSX) # TODO: figure out
 IsolationLevel=PROCESS # required to have quit/exit
@@ -92,9 +89,6 @@ RetryCount=2
 IsolationLevel=PROCESS
 Arguments=-X:CompilationThreshold 0 "$(TEST_FILE)" # ensure CompilationThreshold is 0 otherwise tests are meaningless!
 
-[IronPython.test_setcomp]
-IsolationLevel=PROCESS # https://github.com/IronLanguages/ironpython3/issues/489
-
 [IronPython.test_stdconsole]
 Timeout=600000 # 10 minute timeout