Don't explicitly pass requested representations to constants; implement ConstantS

src/ia32/lithium-ia32.cc

Index: src/ia32/lithium-ia32.cc
diff --git a/src/ia32/lithium-ia32.cc b/src/ia32/lithium-ia32.cc
index 1fd0f49d3083bd90a5f05a5ef6005985037f9bf2..28c4d2cb3bc3fcdf88cf9daebc9a3f31be5459b5 100644
--- a/src/ia32/lithium-ia32.cc
+++ b/src/ia32/lithium-ia32.cc
@@ -2108,7 +2108,9 @@ LInstruction* LChunkBuilder::DoReturn(HReturn* instr) {
 
 LInstruction* LChunkBuilder::DoConstant(HConstant* instr) {
   Representation r = instr->representation();
-  if (r.IsInteger32()) {
+  if (r.IsSmi()) {
+    return DefineAsRegister(new(zone()) LConstantS);
+  } else if (r.IsInteger32()) {
     return DefineAsRegister(new(zone()) LConstantI);
   } else if (r.IsDouble()) {
     double value = instr->DoubleValue();
@@ -2119,7 +2121,7 @@ LInstruction* LChunkBuilder::DoConstant(HConstant* instr) {
     } else {
       return DefineX87TOS(new(zone()) LConstantD(NULL));
     }
-  } else if (r.IsSmiOrTagged()) {
+  } else if (r.IsTagged()) {
     return DefineAsRegister(new(zone()) LConstantT);
   } else {
     UNREACHABLE();