[x86] Avoid memory form of PUSH/CALL for ATOM.

src/base/cpu.h

 // Copyright 2006-2013 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 // This module contains the architecture-specific code. This make the rest of
 // the code less dependent on differences between different processor
 // architecture.
 // The classes have the same definition for all architectures. The
 // implementation for a particular architecture is put in cpu_<arch>.cc.
 // The build system then uses the implementation for the target architecture.
@@ skipping 67 matching lines @@
   bool has_sahf() const { return has_sahf_; }
   bool has_mmx() const { return has_mmx_; }
   bool has_sse() const { return has_sse_; }
   bool has_sse2() const { return has_sse2_; }
   bool has_sse3() const { return has_sse3_; }
   bool has_ssse3() const { return has_ssse3_; }
   bool has_sse41() const { return has_sse41_; }
   bool has_sse42() const { return has_sse42_; }
   bool has_avx() const { return has_avx_; }
   bool has_fma3() const { return has_fma3_; }
+  bool is_atom() const { return is_atom_; }
 
   // arm features
   bool has_idiva() const { return has_idiva_; }
   bool has_neon() const { return has_neon_; }
   bool has_thumb2() const { return has_thumb2_; }
   bool has_vfp() const { return has_vfp_; }
   bool has_vfp3() const { return has_vfp3_; }
   bool has_vfp3_d32() const { return has_vfp3_d32_; }
 
   // mips features
@@ skipping 14 matching lines @@
   bool has_fpu_;
   bool has_cmov_;
   bool has_sahf_;
   bool has_mmx_;
   bool has_sse_;
   bool has_sse2_;
   bool has_sse3_;
   bool has_ssse3_;
   bool has_sse41_;
   bool has_sse42_;
+  bool is_atom_;
   bool has_avx_;
   bool has_fma3_;
   bool has_idiva_;
   bool has_neon_;
   bool has_thumb2_;
   bool has_vfp_;
   bool has_vfp3_;
   bool has_vfp3_d32_;
   bool is_fp64_mode_;
 };
 
 } }  // namespace v8::base
 
 #endif  // V8_BASE_CPU_H_