Fix for 3303 MultithreadedParallelIsolates has a race condition.

src/arm/simulator-arm.cc

Index: src/arm/simulator-arm.cc
diff --git a/src/arm/simulator-arm.cc b/src/arm/simulator-arm.cc
index 80b46e04df366b39cb40724613344beaf4882304..6197de232d200d3e88cc05802d864e8a626c8193 100644
--- a/src/arm/simulator-arm.cc
+++ b/src/arm/simulator-arm.cc
@@ -634,6 +634,7 @@ void Simulator::set_last_debugger_input(char* input) {
 void Simulator::FlushICache(v8::internal::HashMap* i_cache,
                             void* start_addr,
                             size_t size) {
+  if (i_cache == NULL) return;

[Sven Panne, 2014/05/05 07:54:14]

Huh? Does this really belong to this CL?

   intptr_t start = reinterpret_cast<intptr_t>(start_addr);
   int intra_line = (start & CachePage::kLineMask);
   start -= intra_line;