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

src/compiler/x64/instruction-selector-x64.cc

Index: src/compiler/x64/instruction-selector-x64.cc
diff --git a/src/compiler/x64/instruction-selector-x64.cc b/src/compiler/x64/instruction-selector-x64.cc
index bf6b170e414b1eb568fb727e20ed69550ff512e8..f0b982d087b83335c4d73941104ee04ae2522b04 100644
--- a/src/compiler/x64/instruction-selector-x64.cc
+++ b/src/compiler/x64/instruction-selector-x64.cc
@@ -941,8 +941,11 @@ void InstructionSelector::VisitCall(Node* node) {
   for (NodeVectorRIter input = buffer.pushed_nodes.rbegin();
        input != buffer.pushed_nodes.rend(); input++) {
     // TODO(titzer): handle pushing double parameters.
-    Emit(kX64Push, NULL,
-         g.CanBeImmediate(*input) ? g.UseImmediate(*input) : g.Use(*input));
+    InstructionOperand* value =
+        g.CanBeImmediate(*input)
+            ? g.UseImmediate(*input)
+            : FLAG_intel_atom ? g.UseRegister(*input) : g.Use(*input);
+    Emit(kX64Push, NULL, value);
   }
 
   // Select the appropriate opcode based on the call type.