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

src/arm/lithium-arm.h

Index: src/arm/lithium-arm.h
diff --git a/src/arm/lithium-arm.h b/src/arm/lithium-arm.h
index e4016c4bd1150724b1574a5876dc2438cf64f8cf..6ae65e8096b89554d4cae2b67bb9f1bd3c09f2dd 100644
--- a/src/arm/lithium-arm.h
+++ b/src/arm/lithium-arm.h
@@ -87,6 +87,7 @@ class LCodeGen;
   V(CmpT)                                       \
   V(ConstantD)                                  \
   V(ConstantI)                                  \
+  V(ConstantS)                                  \
   V(ConstantT)                                  \
   V(Context)                                    \
   V(DebugBreak)                                 \
@@ -1206,6 +1207,15 @@ class LConstantI: public LTemplateInstruction<1, 0, 0> {
 };
 
 
+class LConstantS: public LTemplateInstruction<1, 0, 0> {
+ public:
+  DECLARE_CONCRETE_INSTRUCTION(ConstantS, "constant-s")
+  DECLARE_HYDROGEN_ACCESSOR(Constant)
+
+  Smi* value() const { return Smi::FromInt(hydrogen()->Integer32Value()); }
+};
+
+
 class LConstantD: public LTemplateInstruction<1, 0, 0> {
  public:
   DECLARE_CONCRETE_INSTRUCTION(ConstantD, "constant-d")