Implement crankshaft support for pixel array loads.

src/hydrogen.h

Index: src/hydrogen.h
diff --git a/src/hydrogen.h b/src/hydrogen.h
index 0178f3f85b2e74dc79860cbca93b3c0a6547bfd5..9d0cddf145ad737cee5d4911fef08cccf1bc88bb 100644
--- a/src/hydrogen.h
+++ b/src/hydrogen.h
@@ -791,6 +791,9 @@ class HGraphBuilder: public AstVisitor {
   HInstruction* BuildLoadKeyedFastElement(HValue* object,
                                           HValue* key,
                                           Property* expr);
+  HInstruction* BuildLoadKeyedPixelArrayElement(HValue* object,
+                                                HValue* key,
+                                                Property* expr);
   HInstruction* BuildLoadKeyedGeneric(HValue* object,
                                       HValue* key);