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

src/ic/x64/handler-compiler-x64.cc

Index: src/ic/x64/handler-compiler-x64.cc
diff --git a/src/ic/x64/handler-compiler-x64.cc b/src/ic/x64/handler-compiler-x64.cc
index feea10360f51ec0b54239ccbff2a9504684562cb..5d2935931668465f3c95630db77f032a4ca5c725 100644
--- a/src/ic/x64/handler-compiler-x64.cc
+++ b/src/ic/x64/handler-compiler-x64.cc
@@ -93,6 +93,8 @@ void PropertyHandlerCompiler::GenerateApiAccessorCall(
   DCHECK(optimization.is_simple_api_call());
 
   __ PopReturnAddressTo(scratch);
+  // accessor_holder
+  __ Push(accessor_holder);

[Yuki, 2017/06/22 14:52:53]

It looks like that I broke some ABI because I've added an extra data on stack,
which is not expected for someone.

https://luci-logdog.appspot.com/v/?s=chromium%2Fbb%2Ftryserver.v8%2Fv8_linux6...

Do you have any ideas who defines and checks this ABI and how I can add an
additional data?

[Toon Verwaest, 2017/06/23 12:11:42]

CallApiCallbackStub does 

2780   int stack_space = 0;
2781   Operand* stack_space_operand = &length_operand;
2782   stack_space = argc + FCA::kArgsLength + 1;
2783   stack_space_operand = nullptr;
2784   CallApiFunctionAndReturn(masm, api_function_address, thunk_ref,
callback_arg,
2785                            stack_space, stack_space_operand,
2786                            return_value_operand, &context_restore_operand);

I presume that length is now off-by-1, meaning you won't pop enough values on
the return. I presume you only want this argument to be present for the stub
call, so what about just conditionally pushing it after
PushReturnAddressFrom(scratch) (only if LAP) and popping it in the stub (if
LAP)?

[Yuki, 2017/06/26 07:38:27]

Thanks!  You're right, now the tests pass.

What about always (unconditionally) pushing the accessor_holder on stack and
popping it?  Assuming that we're almost always using LAP, it's not that bad? 
It's a little confusing for me that the stack layout changes depending on LAP or
not.

   // receiver
   __ Push(receiver);
   // Write the arguments to stack frame.