Use FAR jump in GenerateCompareFlatAsciiStrings.

src/x64/code-stubs-x64.cc

 // Copyright 2013 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 4317 matching lines @@
   const Register min_length = scratch1;
 
   Label compare_lengths;
   // If min-length is zero, go directly to comparing lengths.
   __ SmiTest(min_length);
   __ j(zero, &compare_lengths, Label::kNear);
 
   // Compare loop.
   Label result_not_equal;
   GenerateAsciiCharsCompareLoop(masm, left, right, min_length, scratch2,
-                                &result_not_equal, Label::kNear);
+                                &result_not_equal,
+                                // In debug-code mode, SmiTest below might push
+                                // the target label outside the near range.
+                                Label::kFar);
 
   // Completed loop without finding different characters.
   // Compare lengths (precomputed).
   __ bind(&compare_lengths);
   __ SmiTest(length_difference);
   Label length_not_equal;
   __ j(not_zero, &length_not_equal, Label::kNear);
 
   // Result is EQUAL.
   __ Move(rax, Smi::FromInt(EQUAL));
@@ skipping 1342 matching lines @@
   __ bind(&fast_elements_case);
   GenerateCase(masm, FAST_ELEMENTS);
 }
 
 
 #undef __
 
 } }  // namespace v8::internal
 
 #endif  // V8_TARGET_ARCH_X64