Move RMA::Label out of the class, so it can be forward declared.

src/compiler/raw-machine-assembler.h

Index: src/compiler/raw-machine-assembler.h
diff --git a/src/compiler/raw-machine-assembler.h b/src/compiler/raw-machine-assembler.h
index d48c24d616f16e9a9b984d9e1eafe05d992b6305..9b9a836d58adb4c2b228e439b993319d8175ebc1 100644
--- a/src/compiler/raw-machine-assembler.h
+++ b/src/compiler/raw-machine-assembler.h
@@ -19,8 +19,10 @@ namespace internal {
 namespace compiler {
 
 class BasicBlock;
+class RawMachineLabel;
 class Schedule;
 
+
 // The RawMachineAssembler produces a low-level IR graph. All nodes are wired
 // into a graph and also placed into a schedule immediately, hence subsequent
 // code generation can happen without the need for scheduling.
@@ -34,19 +36,6 @@ class Schedule;
 // non-schedulable due to missing control and effect dependencies.
 class RawMachineAssembler {
  public:
-  class Label {
-   public:
-    Label() : block_(NULL), used_(false), bound_(false) {}
-    ~Label() { DCHECK(bound_ || !used_); }
-
-   private:
-    BasicBlock* block_;
-    bool used_;
-    bool bound_;
-    friend class RawMachineAssembler;
-    DISALLOW_COPY_AND_ASSIGN(Label);
-  };
-
   RawMachineAssembler(Isolate* isolate, Graph* graph,
                       CallDescriptor* call_descriptor,
                       MachineType word = kMachPtr,
@@ -584,14 +573,15 @@ class RawMachineAssembler {
   // the current basic block or create new basic blocks for labels.
 
   // Control flow.
-  void Goto(Label* label);
-  void Branch(Node* condition, Label* true_val, Label* false_val);
-  void Switch(Node* index, Label* default_label, int32_t* case_values,
-              Label** case_labels, size_t case_count);
+  void Goto(RawMachineLabel* label);
+  void Branch(Node* condition, RawMachineLabel* true_val,
+              RawMachineLabel* false_val);
+  void Switch(Node* index, RawMachineLabel* default_label, int32_t* case_values,
+              RawMachineLabel** case_labels, size_t case_count);
   void Return(Node* value);
   void Return(Node* v1, Node* v2);
   void Return(Node* v1, Node* v2, Node* v3);
-  void Bind(Label* label);
+  void Bind(RawMachineLabel* label);
   void Deoptimize(Node* state);
 
   // Variables.
@@ -624,8 +614,8 @@ class RawMachineAssembler {
 
  private:
   Node* MakeNode(const Operator* op, int input_count, Node** inputs);
-  BasicBlock* Use(Label* label);
-  BasicBlock* EnsureBlock(Label* label);
+  BasicBlock* Use(RawMachineLabel* label);
+  BasicBlock* EnsureBlock(RawMachineLabel* label);
   BasicBlock* CurrentBlock();
 
   Schedule* schedule() { return schedule_; }
@@ -646,6 +636,20 @@ class RawMachineAssembler {
   DISALLOW_COPY_AND_ASSIGN(RawMachineAssembler);
 };
 
+
+class RawMachineLabel final {
+ public:
+  RawMachineLabel();
+  ~RawMachineLabel();
+
+ private:
+  BasicBlock* block_;
+  bool used_;
+  bool bound_;
+  friend class RawMachineAssembler;
+  DISALLOW_COPY_AND_ASSIGN(RawMachineLabel);
+};
+
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8