Mark instruction blocks with spills (for frame elision).

src/compiler/frame-elider.cc

 // Copyright 2015 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/base/adapters.h"
 #include "src/compiler/frame-elider.h"
 
 namespace v8 {
 namespace internal {
 namespace compiler {
 
 FrameElider::FrameElider(InstructionSequence* code) : code_(code) {}
 
 void FrameElider::Run() {
   MarkBlocks();
   PropagateMarks();
   MarkDeConstruction();
 }
 
 
 void FrameElider::MarkBlocks() {
   for (auto block : instruction_blocks()) {
+    if (block->needs_frame()) continue;
     for (auto i = block->code_start(); i < block->code_end(); ++i) {
       if (InstructionAt(i)->IsCall()) {
         block->mark_needs_frame();
         break;
       }
     }
   }
 }
 
 
@@ skipping 87 matching lines @@
 }
 
 
 Instruction* FrameElider::InstructionAt(int index) const {
   return code_->InstructionAt(index);
 }
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8