Huge speedup for testsuite categories

This ensures that we won't try to do cleanups of test cases that we are skipping
e.g. this brings down the time required to run the cmdline category on my machine from ~70s to ~30s

llvm-svn: 184363

lldb/test/dotest.py

@@ -1204,6 +1204,7 @@ if not noHeaders:
 
 if not os.path.isdir(sdir_name):
     os.mkdir(sdir_name)
+where_to_save_session = os.getcwd()
 fname = os.path.join(sdir_name, "TestStarted")
 with open(fname, "w") as f:
     print >> f, "Test started at: %s\n" % timestamp_started
@@ -1450,6 +1451,8 @@ for ia in range(len(archs) if iterArchs else 1):
             def hardMarkAsSkipped(self,test):
                 getattr(test, test._testMethodName).__func__.__unittest_skip__ = True
                 getattr(test, test._testMethodName).__func__.__unittest_skip_why__ = "test case does not fall in any category of interest for this run"
+                test.__class__.__unittest_skip__ = True
+                test.__class__.__unittest_skip_why__ = "test case does not fall in any category of interest for this run"
 
             def startTest(self, test):
                 if self.shouldSkipBecauseOfCategories(test):
@@ -1564,6 +1567,7 @@ if useCategories and len(failuresPerCategory) > 0:
     for category in failuresPerCategory:
         sys.stderr.write("%s - %d\n" % (category,failuresPerCategory[category]))
 
+os.chdir(where_to_save_session)
 fname = os.path.join(sdir_name, "TestFinished")
 with open(fname, "w") as f:
     print >> f, "Test finished at: %s\n" % datetime.datetime.now().strftime("%Y-%m-%d-%H_%M_%S")