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

src/x64/assembler-x64.cc

Index: src/x64/assembler-x64.cc
diff --git a/src/x64/assembler-x64.cc b/src/x64/assembler-x64.cc
index 96422f6863fa86b90b655f3568680a48e61f6731..e4d099392c1ceae5da6eea3389018e18d6dbea81 100644
--- a/src/x64/assembler-x64.cc
+++ b/src/x64/assembler-x64.cc
@@ -60,15 +60,20 @@ void CpuFeatures::ProbeImpl(bool cross_compile) {
   if (cpu.has_sahf() && FLAG_enable_sahf) supported_ |= 1u << SAHF;
   if (cpu.has_avx() && EnableAVX()) supported_ |= 1u << AVX;
   if (cpu.has_fma3() && FLAG_enable_fma3) supported_ |= 1u << FMA3;
+  if (strcmp(FLAG_mcpu, "auto") == 0) {
+    if (cpu.is_atom()) supported_ |= 1u << ATOM;
+  } else if (strcmp(FLAG_mcpu, "atom") == 0) {
+    supported_ |= 1u << ATOM;
+  }
 }
 
 
 void CpuFeatures::PrintTarget() { }
 void CpuFeatures::PrintFeatures() {
-  printf("SSE3=%d SSE4_1=%d SAHF=%d AVX=%d FMA3=%d\n",
+  printf("SSE3=%d SSE4_1=%d SAHF=%d AVX=%d FMA3=%d ATOM=%d\n",
          CpuFeatures::IsSupported(SSE3), CpuFeatures::IsSupported(SSE4_1),
          CpuFeatures::IsSupported(SAHF), CpuFeatures::IsSupported(AVX),
-         CpuFeatures::IsSupported(FMA3));
+         CpuFeatures::IsSupported(FMA3), CpuFeatures::IsSupported(ATOM));
 }