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

src/arm/code-stubs-arm.cc

Index: src/arm/code-stubs-arm.cc
diff --git a/src/arm/code-stubs-arm.cc b/src/arm/code-stubs-arm.cc
index 323a78d7b966cfc6796348049a9707428f8d9b7c..76245aaf89e9bb98ca16dd71455384a8c82bfe13 100644
--- a/src/arm/code-stubs-arm.cc
+++ b/src/arm/code-stubs-arm.cc
@@ -2762,8 +2762,9 @@ void CallApiCallbackStub::Generate(MacroAssembler* masm) {
   //  --
   //  -- sp[0]               : last argument
   //  -- ...
-  //  -- sp[(argc - 1)* 4]   : first argument
+  //  -- sp[(argc - 1) * 4]  : first argument
   //  -- sp[argc * 4]        : receiver
+  //  -- sp[(argc + 1) * 4]  : accessor_holder
   // -----------------------------------
 
   Register callee = r0;
@@ -2789,10 +2790,6 @@ void CallApiCallbackStub::Generate(MacroAssembler* masm) {
 
   // context save
   __ push(context);
-  if (!is_lazy()) {
-    // load context from callee
-    __ ldr(context, FieldMemOperand(callee, JSFunction::kContextOffset));
-  }
 
   // callee
   __ push(callee);
@@ -2812,6 +2809,20 @@ void CallApiCallbackStub::Generate(MacroAssembler* masm) {
   // holder
   __ push(holder);
 
+  // enter a new context
+  if (is_lazy()) {
+    // load context from accessor_holder
+    Register accessor_holder = context;
+    __ ldr(accessor_holder,
+           MemOperand(sp, (FCA::kArgsLength + 1 argc()) * kPointerSize));
+    __ ldr(scratch, FieldMemOperand(accessor_holder, HeapObject::kMapOffset));
+    __ GetMapConstructor(scratch, scratch, context, callee);
+    __ ldr(context, FieldMemOperand(scratch, JSFunction::kContextOffset));
+  } else {
+    // load context from callee
+    __ ldr(context, FieldMemOperand(callee, JSFunction::kContextOffset));
+  }
+
   // Prepare arguments.
   __ mov(scratch, sp);