Always set the callee's context when calling a function from optimized code.

src/x64/lithium-codegen-x64.cc

Index: src/x64/lithium-codegen-x64.cc
diff --git a/src/x64/lithium-codegen-x64.cc b/src/x64/lithium-codegen-x64.cc
index 3e688dfd004c7bc4aa29dfa2637ce62ba6203bc4..36de28ff19d93261ed00520d46329e9d004c4585 100644
--- a/src/x64/lithium-codegen-x64.cc
+++ b/src/x64/lithium-codegen-x64.cc
@@ -2892,14 +2892,8 @@ void LCodeGen::CallKnownFunction(Handle<JSFunction> function,
       __ LoadHeapObject(rdi, function);
     }
 
-    // Change context if needed.
-    bool change_context =
-        (info()->closure()->context() != function->context()) ||
-        scope()->contains_with() ||
-        (scope()->num_heap_slots() > 0);
-    if (change_context) {
-      __ movq(rsi, FieldOperand(rdi, JSFunction::kContextOffset));
-    }
+    // Change context.
+    __ movq(rsi, FieldOperand(rdi, JSFunction::kContextOffset));
 
     // Set rax to arguments count if adaption is not needed. Assumes that rax
     // is available to write to at this point.