Implement specialized IC code stubs for pixel array stores.

src/arm/ic-arm.cc

Index: src/arm/ic-arm.cc
diff --git a/src/arm/ic-arm.cc b/src/arm/ic-arm.cc
index 301b915bb1e500fcfb07a6fd1230963a457615a7..6c7aa0643ace46483f80a1032373044605b4db06 100644
--- a/src/arm/ic-arm.cc
+++ b/src/arm/ic-arm.cc
@@ -1475,24 +1475,20 @@ void KeyedStoreIC::GenerateGeneric(MacroAssembler* masm) {
   // Check whether the elements is a pixel array.
   // r4: elements map.
   __ bind(&check_pixel_array);
-  __ LoadRoot(ip, Heap::kPixelArrayMapRootIndex);
-  __ cmp(r4, ip);
-  __ b(ne, &slow);
-  // Check that the value is a smi. If a conversion is needed call into the
-  // runtime to convert and clamp.
-  __ JumpIfNotSmi(value, &slow);
-  __ mov(r4, Operand(key, ASR, kSmiTagSize));  // Untag the key.
-  __ ldr(ip, FieldMemOperand(elements, PixelArray::kLengthOffset));
-  __ cmp(r4, Operand(ip));
-  __ b(hs, &slow);
-  __ mov(r5, Operand(value, ASR, kSmiTagSize));  // Untag the value.
-  __ Usat(r5, 8, Operand(r5));  // Clamp the value to [0..255].
-
-  // Get the pointer to the external array. This clobbers elements.
-  __ ldr(elements,
-         FieldMemOperand(elements, PixelArray::kExternalPointerOffset));
-  __ strb(r5, MemOperand(elements, r4));  // Elements is now external array.
-  __ Ret();
+  GenerateFastPixelArrayStore(masm,
+                              r2,
+                              r1,
+                              r0,
+                              elements,
+                              r4,
+                              r5,
+                              r6,
+                              false,
+                              false,
+                              NULL,
+                              &slow,
+                              &slow,
+                              &slow);
 
   // Extra capacity case: Check if there is extra capacity to
   // perform the store and update the length. Used for adding one