Compile FastCloneShallowObjectStub using Crankshaft.

src/ia32/lithium-ia32.cc

Index: src/ia32/lithium-ia32.cc
diff --git a/src/ia32/lithium-ia32.cc b/src/ia32/lithium-ia32.cc
index 5d539ed8c0c485dd10e40af64f619960defe1721..39079d338927b11bf32cada962334653dd9a0484 100644
--- a/src/ia32/lithium-ia32.cc
+++ b/src/ia32/lithium-ia32.cc
@@ -1026,6 +1026,12 @@ LInstruction* LChunkBuilder::DoInstanceOfKnownGlobal(
 }
 
 
+LInstruction* LChunkBuilder::DoInstanceSize(HInstanceSize* instr) {
+  LOperand* object = UseRegisterAtStart(instr->object());
+  return DefineAsRegister(new(zone()) LInstanceSize(object));
+}
+
+
 LInstruction* LChunkBuilder::DoWrapReceiver(HWrapReceiver* instr) {
   LOperand* receiver = UseRegister(instr->receiver());
   LOperand* function = UseRegisterAtStart(instr->function());