Support conversion of clamped double values for pixel arrays in Crankshaft.

src/arm/macro-assembler-arm.h

Index: src/arm/macro-assembler-arm.h
diff --git a/src/arm/macro-assembler-arm.h b/src/arm/macro-assembler-arm.h
index 8e8409d6914dee698cc73af5fdda26a83f1f0de6..6986aa3ae2f17c295def9dea530c5f2a5ee97d20 100644
--- a/src/arm/macro-assembler-arm.h
+++ b/src/arm/macro-assembler-arm.h
@@ -987,6 +987,13 @@ class MacroAssembler: public Assembler {
                                  Register result);
 
 
+  void ClampUint8(Register output_reg, Register input_reg);
+
+  void ClampDoubleToUint8(Register result_reg,
+                          DoubleRegister input_reg,
+                          DoubleRegister temp_double_reg);
+
+
  private:
   void CallCFunctionHelper(Register function,
                            ExternalReference function_reference,