Direct call to eval passes strict mode through.

src/x64/codegen-x64.cc

 // Copyright 2010 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 5384 matching lines @@
                                                      NOT_INSIDE_TYPEOF,
                                                      &slow);
       frame_->Push(&fun);
       if (arg_count > 0) {
         frame_->PushElementAt(arg_count);
       } else {
         frame_->Push(Factory::undefined_value());
       }
       frame_->PushParameterAt(-1);
 
+      // Push the strict mode flag.
+      frame_->Push(Smi::FromInt(strict_mode_flag()));
+
       // Resolve the call.
       result =
-          frame_->CallRuntime(Runtime::kResolvePossiblyDirectEvalNoLookup, 3);
+          frame_->CallRuntime(Runtime::kResolvePossiblyDirectEvalNoLookup, 4);
 
       done.Jump(&result);
       slow.Bind();
     }
 
     // Prepare the stack for the call to ResolvePossiblyDirectEval by
     // pushing the loaded function, the first argument to the eval
     // call and the receiver.
     frame_->PushElementAt(arg_count + 1);
     if (arg_count > 0) {
       frame_->PushElementAt(arg_count);
     } else {
       frame_->Push(Factory::undefined_value());
     }
     frame_->PushParameterAt(-1);
 
+    // Push the strict mode flag.
+    frame_->Push(Smi::FromInt(strict_mode_flag()));
+
     // Resolve the call.
-    result = frame_->CallRuntime(Runtime::kResolvePossiblyDirectEval, 3);
+    result = frame_->CallRuntime(Runtime::kResolvePossiblyDirectEval, 4);
 
     // If we generated fast-case code bind the jump-target where fast
     // and slow case merge.
     if (done.is_linked()) done.Bind(&result);
 
     // The runtime call returns a pair of values in rax (function) and
     // rdx (receiver). Touch up the stack with the right values.
     Result receiver = allocator_->Allocate(rdx);
     frame_->SetElementAt(arg_count + 1, &result);
     frame_->SetElementAt(arg_count, &receiver);
@@ skipping 3362 matching lines @@
 }
 
 #endif
 
 
 #undef __
 
 } }  // namespace v8::internal
 
 #endif  // V8_TARGET_ARCH_X64