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

src/ia32/macro-assembler-ia32.h

Index: src/ia32/macro-assembler-ia32.h
diff --git a/src/ia32/macro-assembler-ia32.h b/src/ia32/macro-assembler-ia32.h
index f88d992fc7acc019e16d1dd524f1e59a4fe4c121..9cb8a3eed3d547f4aef63325739e6120f77b9290 100644
--- a/src/ia32/macro-assembler-ia32.h
+++ b/src/ia32/macro-assembler-ia32.h
@@ -238,6 +238,13 @@ class MacroAssembler: public Assembler {
   // jcc instructions (je, ja, jae, jb, jbe, je, and jz).
   void FCmp();
 
+  void ClampUint8(Register reg);
+
+  void ClampDoubleToUint8(XMMRegister input_reg,
+                          XMMRegister scratch_reg,
+                          Register result_reg);
+
+
   // Smi tagging support.
   void SmiTag(Register reg) {
     ASSERT(kSmiTag == 0);