Add support for IncrementCounter in Hydrogen.

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 5165f1bbb6dcaea5515e287dec7192137c846cc3..bd47abd3dbca663f13a2973f9465b43bfef55ffa 100644
--- a/src/arm/lithium-arm.h
+++ b/src/arm/lithium-arm.h
@@ -85,6 +85,7 @@ class LCodeGen;
   V(CmpMapAndBranch)                            \
   V(CmpT)                                       \
   V(ConstantD)                                  \
+  V(ConstantE)                                  \
   V(ConstantI)                                  \
   V(ConstantS)                                  \
   V(ConstantT)                                  \
@@ -1252,6 +1253,15 @@ class LConstantD: public LTemplateInstruction<1, 0, 0> {
 };
 
 
+class LConstantE: public LTemplateInstruction<1, 0, 0> {
+ public:
+  DECLARE_CONCRETE_INSTRUCTION(ConstantE, "constant-e")
+  DECLARE_HYDROGEN_ACCESSOR(Constant)
+
+  ExternalReference value() const { return hydrogen()->ExternalValue(); }
+};
+
+
 class LConstantT: public LTemplateInstruction<1, 0, 0> {
  public:
   DECLARE_CONCRETE_INSTRUCTION(ConstantT, "constant-t")