Mark instruction blocks with spills (for frame elision).

src/compiler/register-allocator.h

Index: src/compiler/register-allocator.h
diff --git a/src/compiler/register-allocator.h b/src/compiler/register-allocator.h
index 41f00af2d5f0035590939113600add1f59ebdf90..447e92f54a56eacfd6881308d83633636ca49320 100644
--- a/src/compiler/register-allocator.h
+++ b/src/compiler/register-allocator.h
@@ -418,9 +418,13 @@ class LiveRange final : public ZoneObject {
   void SetUseHints(int register_index);
   void UnsetUseHints() { SetUseHints(kUnassignedRegister); }
 
- private:
   struct SpillAtDefinitionList;
 
+  SpillAtDefinitionList* spills_at_definition() const {
+    return spills_at_definition_;
+  }
+
+ private:
   void set_spill_type(SpillType value) {
     bits_ = SpillTypeField::update(bits_, value);
   }
@@ -855,6 +859,21 @@ class GreedyAllocator final : public RegisterAllocator {
 };
 
 
+class SpillSlotLocator final : public ZoneObject {
+ public:
+  explicit SpillSlotLocator(RegisterAllocationData* data);
+
+  void LocateSpillSlots();
+
+ private:
+  RegisterAllocationData* data() const { return data_; }
+
+  RegisterAllocationData* const data_;
+
+  DISALLOW_COPY_AND_ASSIGN(SpillSlotLocator);
+};
+
+
 class OperandAssigner final : public ZoneObject {
  public:
   explicit OperandAssigner(RegisterAllocationData* data);