[turbofan] Re-enable tests that are not longer too slow.

test/mjsunit/mjsunit.status

Index: test/mjsunit/mjsunit.status
diff --git a/test/mjsunit/mjsunit.status b/test/mjsunit/mjsunit.status
index 74072ab791b6a4eef3837ce6e18e89de4b325dd2..849821fec8ce8bfd4b4ce84753f7156351737c68 100644
--- a/test/mjsunit/mjsunit.status
+++ b/test/mjsunit/mjsunit.status
@@ -64,17 +64,12 @@
 
   # Some tests are just too slow to run for now.
   'big-object-literal': [PASS, NO_VARIANTS],
-  'bit-not': [PASS, NO_VARIANTS],
   'json2': [PASS, NO_VARIANTS],
   'packed-elements': [PASS, NO_VARIANTS],
-  'string-indexof-1': [PASS, NO_VARIANTS],
-  'unbox-double-arrays': [PASS, NO_VARIANTS],
   'unicode-test': [PASS, NO_VARIANTS],
   'whitespaces': [PASS, NO_VARIANTS],
-  'compiler/osr-assert': [PASS, NO_VARIANTS],
   'ignition/regress-599001-verifyheap': [PASS, NO_VARIANTS],
   'es6/string-fromcodepoint': [PASS, NO_VARIANTS],
-  'regress/regress-2185-2': [PASS, NO_VARIANTS],
   'regress/regress-2612': [PASS, NO_VARIANTS],
 
   # Issue 3660: Replacing activated TurboFan frames by unoptimized code does