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

src/x87/code-stubs-x87.cc

Index: src/x87/code-stubs-x87.cc
diff --git a/src/x87/code-stubs-x87.cc b/src/x87/code-stubs-x87.cc
index e18336d8100d8f589c6a2d0ffee24aa1cceaddc9..cc42f091ea6d21bce5be5c2c76f7cc63570424e0 100644
--- a/src/x87/code-stubs-x87.cc
+++ b/src/x87/code-stubs-x87.cc
@@ -3237,6 +3237,7 @@ void CallApiCallbackStub::Generate(MacroAssembler* masm) {
   //  -- ...
   //  -- esp[argc * 4]       : first argument
   //  -- esp[(argc + 1) * 4] : receiver
+  //  -- esp[(argc + 2) * 4] : accessor_holder
   // -----------------------------------
 
   Register callee = edi;
@@ -3289,16 +3290,25 @@ void CallApiCallbackStub::Generate(MacroAssembler* masm) {
   // holder
   __ push(holder);
 
+  // enter a new context
+  if (is_lazy()) {
+    // load context from accessor_holder
+    Register accessor_holder = context;
+    __ movp(accessor_holder,
+            MemOperand(esp, (argc() + FCA::kArgsLength + 1) * kPointerSize));
+    __ movp(scratch, FieldOperand(accessor_holder, HeapObject::kMapOffset));
+    __ GetMapConstructor(scratch, scratch, context);
+    __ movp(context, FieldOperand(scratch, JSFunction::kContextOffset));
+  } else {
+    // load context from callee
+    __ mov(context, FieldOperand(callee, JSFunction::kContextOffset));
+  }
+
   __ mov(scratch, esp);
 
   // push return address
   __ push(return_address);
 
-  if (!is_lazy()) {
-    // load context from callee
-    __ mov(context, FieldOperand(callee, JSFunction::kContextOffset));
-  }
-
   // API function gets reference to the v8::Arguments. If CPU profiler
   // is enabled wrapper function will be called and we need to pass
   // address of the callback as additional parameter, always allocate
@@ -3336,11 +3346,8 @@ void CallApiCallbackStub::Generate(MacroAssembler* masm) {
     return_value_offset = 2 + FCA::kReturnValueOffset;
   }
   Operand return_value_operand(ebp, return_value_offset * kPointerSize);
-  int stack_space = 0;
-  Operand length_operand = ApiParameterOperand(4);
-  Operand* stack_space_operand = &length_operand;
-  stack_space = argc() + FCA::kArgsLength + 1;
-  stack_space_operand = nullptr;
+  const int stack_space = argc() + FCA::kArgsLength + 2;
+  Operand* stack_space_operand = nullptr;
   CallApiFunctionAndReturn(masm, api_function_address, thunk_ref,
                            ApiParameterOperand(1), stack_space,
                            stack_space_operand, return_value_operand,