Set the current context to the function's context when entering to LAP.

src/x64/code-stubs-x64.cc

Index: src/x64/code-stubs-x64.cc
diff --git a/src/x64/code-stubs-x64.cc b/src/x64/code-stubs-x64.cc
index fc080f4c4cc2fc63abbf122d7d4f4e23b903892d..23769ecea604535b27cb147b574cd60b464f9c6b 100644
--- a/src/x64/code-stubs-x64.cc
+++ b/src/x64/code-stubs-x64.cc
@@ -2840,7 +2840,13 @@ void CallApiCallbackStub::Generate(MacroAssembler* masm) {
   // Push return address back on stack.
   __ PushReturnAddressFrom(return_address);
 
-  if (!this->is_lazy()) {
+  if (this->is_lazy()) {

[jochen (gone - plz use gerrit), 2017/03/24 15:10:15]

you could move this entire block before like 2839, then you can use "scratch"

[Yuki, 2017/03/28 14:16:58]

Done.

+    // load context from holder
+    Register temp = rax;
+    __ movp(temp, FieldOperand(holder, HeapObject::kMapOffset));
+    __ GetMapConstructor(temp, temp, context);
+    __ movp(context, FieldOperand(temp, JSFunction::kContextOffset));
+  } else {
     // load context from callee
     __ movp(context, FieldOperand(callee, JSFunction::kContextOffset));
   }