Optionally use 31-bits SMI value for 64-bit system

src/x64/deoptimizer-x64.cc

 // Copyright 2012 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 65 matching lines @@
            call_address >= prev_call_address + patch_size());
     ASSERT(call_address + patch_size() <= code->instruction_end());
 #ifdef DEBUG
     prev_call_address = call_address;
 #endif
   }
 }
 
 
 static const byte kJnsInstruction = 0x79;
+#if V8_USE_31_BIT_SMI_VALUE
+// The Smi::FromInt(reset_value) could be embedded as 4-byte in the generated
+// instruction stream from FullCodeGenerator::EmitProfilingCounterReset.
+static const byte kJnsOffset = 0x19;
+#else
 static const byte kJnsOffset = 0x1d;
+#endif
 static const byte kCallInstruction = 0xe8;
 static const byte kNopByteOne = 0x66;
 static const byte kNopByteTwo = 0x90;
 
 // The back edge bookkeeping code matches the pattern:
 //
 //     add <profiling_counter>, <-delta>
 //     jns ok
 //     call <stack guard>
 //   ok:
@@ skipping 490 matching lines @@
   SetFrameSlot(offset, value);
 }
 
 
 #undef __
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_TARGET_ARCH_X64