Remove relocation lock.

src/heap.cc

Index: src/heap.cc
diff --git a/src/heap.cc b/src/heap.cc
index 76f0a3c9a86e052add7782f4600217d317fc5a44..2dba26e136e68af48224875c624086129713b959 100644
--- a/src/heap.cc
+++ b/src/heap.cc
@@ -162,8 +162,7 @@ Heap::Heap()
 #endif
       promotion_queue_(this),
       configured_(false),
-      chunks_queued_for_free_(NULL),
-      relocation_mutex_(NULL) {
+      chunks_queued_for_free_(NULL) {
   // Allow build-time customization of the max semispace size. Building
   // V8 with snapshots and a non-default max semispace size is much
   // easier if you can define it as part of the build environment.
@@ -1282,8 +1281,6 @@ class ScavengeWeakObjectRetainer : public WeakObjectRetainer {
 
 
 void Heap::Scavenge() {
-  RelocationLock relocation_lock(this);
-
 #ifdef VERIFY_HEAP
   if (FLAG_verify_heap) VerifyNonPointerSpacePointers();
 #endif
@@ -6601,11 +6598,6 @@ bool Heap::SetUp() {
 
   store_buffer()->SetUp();
 
-  if (FLAG_parallel_recompilation) relocation_mutex_ = OS::CreateMutex();
-#ifdef DEBUG
-  relocation_mutex_locked_ = false;
-#endif  // DEBUG
-
   return true;
 }
 
@@ -6708,8 +6700,6 @@ void Heap::TearDown() {
   incremental_marking()->TearDown();
 
   isolate_->memory_allocator()->TearDown();
-
-  delete relocation_mutex_;
 }