Fix path tracer test.

Path tracer is not compatible with --enable-slow-assert.

R=mstarzinger@chromium.org
BUG=v8:3350
LOG=N

Review URL: https://codereview.chromium.org/297193005

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@21542 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

test/cctest/cctest.status

@@ -74,9 +74,6 @@
   # BUG(3287).
   'test-cpu-profiler/SampleWhenFrameIsNotSetup': [PASS, FLAKY],
 
-   # BUG(3350). Crashes.
-  'test-heap/PathTracer': [SKIP],
-
   ############################################################################
   # Slow tests.
   'test-api/Threading1': [PASS, ['mode == debug', SLOW]],

test/cctest/test-heap.cc

@@ -4266,6 +4266,8 @@ TEST(ArrayShiftSweeping) {
 
 #ifdef DEBUG
 TEST(PathTracer) {
+  // Type cast checks fail because the path tracer abuses the map for marking.
+  if (i::FLAG_enable_slow_asserts) return;
   CcTest::InitializeVM();
   v8::HandleScope scope(CcTest::isolate());