x86: enable check of Atom

src/base/cpu.h

Index: src/base/cpu.h
diff --git a/src/base/cpu.h b/src/base/cpu.h
index fe8e1029757f0d37806247366b307eb3e3c13ad7..309860bee58c03e922e2b6f53d3104a9e0087576 100644
--- a/src/base/cpu.h
+++ b/src/base/cpu.h
@@ -70,6 +70,7 @@ class CPU FINAL {
   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_; }
@@ -103,6 +104,7 @@ class CPU FINAL {
   bool has_ssse3_;
   bool has_sse41_;
   bool has_sse42_;
+  bool is_atom_;
   bool has_avx_;
   bool has_fma3_;
   bool has_idiva_;