Fix OOM bug 3976.

src/hydrogen.cc

 // Copyright 2013 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "src/hydrogen.h"
 
 #include <sstream>
 
 #include "src/v8.h"
 
@@ skipping 3338 matching lines @@
       function_state_(NULL),
       initial_function_state_(this, info, NORMAL_RETURN, 0),
       ast_context_(NULL),
       break_scope_(NULL),
       inlined_count_(0),
       globals_(10, info->zone()),
       osr_(new(info->zone()) HOsrBuilder(this)) {
   // This is not initialized in the initializer list because the
   // constructor for the initial state relies on function_state_ == NULL
   // to know it's the initial state.
-  function_state_= &initial_function_state_;
+  function_state_ = &initial_function_state_;

[ulan, 2015/03/20 10:56:54]

Nit: this probably belongs to another CL, but I am fine with landing it here.

[Erik Corry, 2015/03/20 11:39:23]

git cl won't let me omit this change for some reason

   InitializeAstVisitor(info->zone());
   if (FLAG_hydrogen_track_positions) {
     SetSourcePosition(info->shared_info()->start_position());
   }
 }
 
 
 HBasicBlock* HOptimizedGraphBuilder::CreateJoin(HBasicBlock* first,
                                                 HBasicBlock* second,
                                                 BailoutId join_id) {
@@ skipping 6952 matching lines @@
     shr = HShr::cast(left);
   } else {
     return false;
   }
   if (shl->left() != shr->left()) return false;
 
   if (!ShiftAmountsAllowReplaceByRotate(shl->right(), shr->right()) &&
       !ShiftAmountsAllowReplaceByRotate(shr->right(), shl->right())) {
     return false;
   }
-  *operand= shr->left();
+  *operand = shr->left();
   *shift_amount = shr->right();
   return true;
 }
 
 
 bool CanBeZero(HValue* right) {
   if (right->IsConstant()) {
     HConstant* right_const = HConstant::cast(right);
     if (right_const->HasInteger32Value() &&
        (right_const->Integer32Value() & 0x1f) != 0) {
@@ skipping 2396 matching lines @@
   if (ShouldProduceTraceOutput()) {
     isolate()->GetHTracer()->TraceHydrogen(name(), graph_);
   }
 
 #ifdef DEBUG
   graph_->Verify(false);  // No full verify.
 #endif
 }
 
 } }  // namespace v8::internal