[lit] Terminate ": RUN at line N" with ";" not "&&"

This fixes projects/compiler-rt/test/fuzzer/sigusr.test, which was
broken by r333614.  The trouble was that "&&" changes the command for
which "$!" gives the pid.

llvm-svn: 333620
diff --git a/llvm/utils/lit/tests/unit/TestRunner.py b/llvm/utils/lit/tests/unit/TestRunner.py
index 4ade359..89209d8 100644
--- a/llvm/utils/lit/tests/unit/TestRunner.py
+++ b/llvm/utils/lit/tests/unit/TestRunner.py
@@ -99,8 +99,8 @@
         cmd_parser = self.get_parser(parsers, 'MY_RUN:')
         value = cmd_parser.getValue()
         self.assertEqual(len(value), 2)  # there are only two run lines
-        self.assertEqual(value[0].strip(), "%dbg(MY_RUN: at line 4) &&  baz")
-        self.assertEqual(value[1].strip(), "%dbg(MY_RUN: at line 7) &&  foo  bar")
+        self.assertEqual(value[0].strip(), "%dbg(MY_RUN: at line 4)  baz")
+        self.assertEqual(value[1].strip(), "%dbg(MY_RUN: at line 7)  foo  bar")
 
     def test_custom(self):
         parsers = self.make_parsers()