Crankshaft support for IN.

src/x64/lithium-x64.cc

Index: src/x64/lithium-x64.cc
diff --git a/src/x64/lithium-x64.cc b/src/x64/lithium-x64.cc
index 0c36934b5d6af2e853c0db82ec0bfbe2a1fac0da..4b7812465e0dde166754d8218ff7ecce26aa2ccf 100644
--- a/src/x64/lithium-x64.cc
+++ b/src/x64/lithium-x64.cc
@@ -2136,6 +2136,15 @@ LInstruction* LChunkBuilder::DoLeaveInlined(HLeaveInlined* instr) {
   return NULL;
 }
 
+
+LInstruction* LChunkBuilder::DoIn(HIn* instr) {
+  LOperand* key = UseAtStart(instr->key());
+  LOperand* object = UseOrConstantAtStart(instr->object());
+  LIn* result = new LIn(key, object);
+  return MarkAsCall(DefineFixed(result, rax), instr);
+}
+
+
 } }  // namespace v8::internal
 
 #endif  // V8_TARGET_ARCH_X64