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..466b04e9a18161e38389b7b49edbe35fdba28419 100644
--- a/src/ic/x64/handler-compiler-x64.cc
+++ b/src/ic/x64/handler-compiler-x64.cc
@@ -109,7 +109,7 @@ void PropertyHandlerCompiler::GenerateApiAccessorCall(
   Register data = rbx;
   Register holder = rcx;
   Register api_function_address = rdx;
-  scratch = no_reg;
+  Register context = rsi;
 
   // Put callee in place.
   __ LoadAccessor(callee, accessor_holder, accessor_index,
@@ -155,8 +155,20 @@ void PropertyHandlerCompiler::GenerateApiAccessorCall(
   __ Move(api_function_address, function_address,
           RelocInfo::EXTERNAL_REFERENCE);
 
+  // Put context in place.
+  const bool is_lazy = !optimization.is_constant_call();
+  if (is_lazy) {
+    // load context from holder
+    __ movp(scratch, FieldOperand(holder, HeapObject::kMapOffset));
+    __ GetMapConstructor(scratch, scratch, context);
+    __ movp(context, FieldOperand(scratch, JSFunction::kContextOffset));
+  } else {
+    // load context from callee
+    __ movp(context, FieldOperand(callee, JSFunction::kContextOffset));
+  }
+
   // Jump to stub.
-  CallApiCallbackStub stub(isolate, is_store, !optimization.is_constant_call());
+  CallApiCallbackStub stub(isolate, is_store, is_lazy);
   __ TailCallStub(&stub);
 }