Ensure code flushing is disabled in incremental marking.

This fixes some test failures since r12714 which shared the code for
code flushing between full and incremental marking and is only a quick
fix until we can enable incremental code flushing.

R=jkummerow@chromium.org
BUG=v8:1609

Review URL: https://codereview.chromium.org/11137014

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@12723 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

src/mark-compact.cc

@@ -2003,6 +2003,9 @@ void MarkCompactCollector::AfterMarking() {
   // Flush code from collected candidates.
   if (is_code_flushing_enabled()) {
     code_flusher_->ProcessCandidates();
+    // TODO(1609) Currently incremental marker does not support code flushing,
+    // we need to disable it before incremental marking steps for next cycle.
+    EnableCodeFlushing(false);
   }
 
   if (!FLAG_watch_ic_patching) {