[turbofan] Ensure lazy bailout point in exception handler.

src/compiler/instruction.cc

 // Copyright 2014 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/compiler/common-operator.h"
 #include "src/compiler/graph.h"
 #include "src/compiler/instruction.h"
 #include "src/compiler/schedule.h"
 
 namespace v8 {
@@ skipping 385 matching lines @@
 
 
 void PhiInstruction::SetInput(size_t offset, int virtual_register) {
   DCHECK_EQ(InstructionOperand::kInvalidVirtualRegister, operands_[offset]);
   operands_[offset] = virtual_register;
 }
 
 
 InstructionBlock::InstructionBlock(Zone* zone, RpoNumber rpo_number,
                                    RpoNumber loop_header, RpoNumber loop_end,
-                                   bool deferred)
+                                   bool deferred, bool handler)
     : successors_(zone),
       predecessors_(zone),
       phis_(zone),
       ao_number_(rpo_number),
       rpo_number_(rpo_number),
       loop_header_(loop_header),
       loop_end_(loop_end),
       code_start_(-1),
       code_end_(-1),
       deferred_(deferred),
+      handler_(handler),
       needs_frame_(false),
       must_construct_frame_(false),
       must_deconstruct_frame_(false) {}
 
 
 size_t InstructionBlock::PredecessorIndexOf(RpoNumber rpo_number) const {
   size_t j = 0;
   for (InstructionBlock::Predecessors::const_iterator i = predecessors_.begin();
        i != predecessors_.end(); ++i, ++j) {
     if (*i == rpo_number) break;
   }
   return j;
 }
 
 
 static RpoNumber GetRpo(const BasicBlock* block) {
   if (block == NULL) return RpoNumber::Invalid();
   return RpoNumber::FromInt(block->rpo_number());
 }
 
 
 static RpoNumber GetLoopEndRpo(const BasicBlock* block) {
   if (!block->IsLoopHeader()) return RpoNumber::Invalid();
   return RpoNumber::FromInt(block->loop_end()->rpo_number());
 }
 
 
 static InstructionBlock* InstructionBlockFor(Zone* zone,
                                              const BasicBlock* block) {
+  bool is_handler =
+      !block->empty() && block->front()->opcode() == IrOpcode::kIfException;
   InstructionBlock* instr_block = new (zone)
       InstructionBlock(zone, GetRpo(block), GetRpo(block->loop_header()),
-                       GetLoopEndRpo(block), block->deferred());
+                       GetLoopEndRpo(block), block->deferred(), is_handler);
   // Map successors and precessors
   instr_block->successors().reserve(block->SuccessorCount());
   for (BasicBlock* successor : block->successors()) {
     instr_block->successors().push_back(GetRpo(successor));
   }
   instr_block->predecessors().reserve(block->PredecessorCount());
   for (BasicBlock* predecessor : block->predecessors()) {
     instr_block->predecessors().push_back(GetRpo(predecessor));
   }
   return instr_block;
@@ skipping 343 matching lines @@
       os << " B" << succ.ToInt();
     }
     os << "\n";
   }
   return os;
 }
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8