Fix --trace-hydrogen --enable-slow-asserts combination.

R=jkummerow@chromium.org

Review URL: https://codereview.chromium.org/23295035

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@16350 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

src/compiler.cc

@@ -1262,6 +1262,7 @@ CompilationPhase::~CompilationPhase() {
 bool CompilationPhase::ShouldProduceTraceOutput() const {
   // Trace if the appropriate trace flag is set and the phase name's first
   // character is in the FLAG_trace_phase command line parameter.
+  AllowHandleDereference allow_deref;
   bool tracing_on = info()->IsStub()
       ? FLAG_trace_hydrogen_stubs
       : (FLAG_trace_hydrogen &&