Add support for IncrementCounter in Hydrogen.

src/mips/lithium-mips.h

Index: src/mips/lithium-mips.h
diff --git a/src/mips/lithium-mips.h b/src/mips/lithium-mips.h
index ee1c47d0573b74aab0a86ef0d60a1033fe59c1bc..2618c46992ddfc8e468d7ee353508eefa1cebb8a 100644
--- a/src/mips/lithium-mips.h
+++ b/src/mips/lithium-mips.h
@@ -79,6 +79,7 @@ class LCodeGen;
   V(CmpMapAndBranch)                            \
   V(CmpT)                                       \
   V(ConstantD)                                  \
+  V(ConstantE)                                  \
   V(ConstantI)                                  \
   V(ConstantS)                                  \
   V(ConstantT)                                  \
@@ -1210,6 +1211,17 @@ 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()->ExternalReferenceValue();
+  }
+};
+
+
 class LConstantT: public LTemplateInstruction<1, 0, 0> {
  public:
   DECLARE_CONCRETE_INSTRUCTION(ConstantT, "constant-t")