Set a fixed scratch register for ARM code generation...

src/arm/lithium-arm.h

Index: src/arm/lithium-arm.h
===================================================================
--- src/arm/lithium-arm.h	(revision 6144)
+++ src/arm/lithium-arm.h	(working copy)
@@ -726,11 +726,9 @@
  public:
   LIsNullAndBranch(LOperand* value,
                    bool is_strict,
-                   LOperand* temp,
                    int true_block_id,
                    int false_block_id)
       : LIsNull(value, is_strict),
-        temp_(temp),
         true_block_id_(true_block_id),
         false_block_id_(false_block_id) { }
 
@@ -741,10 +739,7 @@
   int true_block_id() const { return true_block_id_; }
   int false_block_id() const { return false_block_id_; }
 
-  LOperand* temp() const { return temp_; }
-
  private:
-  LOperand* temp_;
   int true_block_id_;
   int false_block_id_;
 };
@@ -839,11 +834,9 @@
 class LHasInstanceTypeAndBranch: public LHasInstanceType {
  public:
   LHasInstanceTypeAndBranch(LOperand* value,
-                            LOperand* temporary,
                             int true_block_id,
                             int false_block_id)
       : LHasInstanceType(value),
-        temp_(temporary),
         true_block_id_(true_block_id),
         false_block_id_(false_block_id) { }
 
@@ -855,10 +848,7 @@
   int true_block_id() const { return true_block_id_; }
   int false_block_id() const { return false_block_id_; }
 
-  LOperand* temp() { return temp_; }
-
  private:
-  LOperand* temp_;
   int true_block_id_;
   int false_block_id_;
 };
@@ -1265,17 +1255,12 @@
 
 class LLoadFunctionPrototype: public LUnaryOperation {
  public:
-  LLoadFunctionPrototype(LOperand* function, LOperand* temporary)
-      : LUnaryOperation(function), temporary_(temporary) { }
+  LLoadFunctionPrototype(LOperand* function) : LUnaryOperation(function) { }
 
   DECLARE_CONCRETE_INSTRUCTION(LoadFunctionPrototype, "load-function-prototype")
   DECLARE_HYDROGEN_ACCESSOR(LoadFunctionPrototype)
 
   LOperand* function() const { return input(); }
-  LOperand* temporary() const { return temporary_; }
-
- private:
-  LOperand* temporary_;
 };