Combine smi and overflow checks for count operations.

src/register-allocator-ia32.h

 // Copyright 2008 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 193 matching lines @@
   Result Allocate();
 
   // Allocate a specific register if possible, spilling it from the frame if
   // necessary, or else fail and return an invalid result.
   Result Allocate(Register target);
 
   // Allocate a free register without spilling any from the current frame or
   // fail and return an invalid result.
   Result AllocateWithoutSpilling();
 
+  // Allocate a free byte register without spilling any from the
+  // current frame or fail and return an invalid result.
+  Result AllocateByteRegisterWithoutSpilling();
+
   // Copy the internal state to a register file, to be restored later by
   // RestoreFrom.
   void SaveTo(RegisterFile* register_file) {
     registers_.CopyTo(register_file);
   }
 
   void RestoreFrom(RegisterFile* register_file) {
     register_file->CopyTo(&registers_);
   }
 
  private:
   CodeGenerator* cgen_;
   RegisterFile registers_;
 };
 
 } }  // namespace v8::internal
 
 #endif  // V8_REGISTER_ALLOCATOR_IA32_H_