Introduce SmiValuesAre31Bits and SmiValuesAre32Bits global predicate functions

src/x64/macro-assembler-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 974 matching lines @@
 
 
 bool MacroAssembler::IsUnsafeInt(const int x) {
   static const int kMaxBits = 17;
   return !is_intn(x, kMaxBits);
 }
 
 
 void MacroAssembler::SafeMove(Register dst, Smi* src) {
   ASSERT(!dst.is(kScratchRegister));
-  ASSERT(kSmiValueSize == 32);  // JIT cookie can be converted to Smi.
+  ASSERT(SmiValuesAre32Bits());  // JIT cookie can be converted to Smi.
   if (IsUnsafeInt(src->value()) && jit_cookie() != 0) {
     Move(dst, Smi::FromInt(src->value() ^ jit_cookie()));
     Move(kScratchRegister, Smi::FromInt(jit_cookie()));
     xor_(dst, kScratchRegister);
   } else {
     Move(dst, src);
   }
 }
 
 
 void MacroAssembler::SafePush(Smi* src) {
-  ASSERT(kSmiValueSize == 32);  // JIT cookie can be converted to Smi.
+  ASSERT(SmiValuesAre32Bits());  // JIT cookie can be converted to Smi.
   if (IsUnsafeInt(src->value()) && jit_cookie() != 0) {
     Push(Smi::FromInt(src->value() ^ jit_cookie()));
     Move(kScratchRegister, Smi::FromInt(jit_cookie()));
     xor_(Operand(rsp, 0), kScratchRegister);
   } else {
     Push(src);
   }
 }
 
 
@@ skipping 3676 matching lines @@
   j(greater, &no_memento_available);
   CompareRoot(MemOperand(scratch_reg, -AllocationMemento::kSize),
               Heap::kAllocationMementoMapRootIndex);
   bind(&no_memento_available);
 }
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_TARGET_ARCH_X64