[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 22 matching lines @@
   CPU();
 
   // x86 CPUID information
   const char* vendor() const { return vendor_; }
   int stepping() const { return stepping_; }
   int model() const { return model_; }
   int ext_model() const { return ext_model_; }
   int family() const { return family_; }
   int ext_family() const { return ext_family_; }
   int type() const { return type_; }
+  bool is_atom() const { return is_atom_; }
 
   // arm implementer/part information
   int implementer() const { return implementer_; }
   static const int ARM = 0x41;
   static const int NVIDIA = 0x4e;
   static const int QUALCOMM = 0x51;
   int architecture() const { return architecture_; }
   int variant() const { return variant_; }
   static const int NVIDIA_DENVER = 0x0;
   int part() const { return part_; }
@@ skipping 46 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_