Do not add values to HGraph in Lithium.

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 14bd29baa59a87bbca3bd46f8e80d3545d7b6108..5678bb7505fa51f39d3209d2aec8cc3a78c844c2 100644
--- a/src/mips/lithium-mips.h
+++ b/src/mips/lithium-mips.h
@@ -91,6 +91,7 @@ class LCodeGen;
   V(DoubleToI)                                  \
   V(DoubleToSmi)                                \
   V(Drop)                                       \
+  V(Dummy)                                      \
   V(DummyUse)                                   \
   V(ElementsKind)                               \
   V(ForInCacheArray)                            \
@@ -421,6 +422,13 @@ class LLazyBailout V8_FINAL : public LTemplateInstruction<0, 0, 0> {
 };
 
 
+class LDummy V8_FINAL : public LTemplateInstruction<1, 0, 0> {
+ public:
+  explicit LDummy() { }
+  DECLARE_CONCRETE_INSTRUCTION(Dummy, "dummy")
+};
+
+
 class LDummyUse V8_FINAL : public LTemplateInstruction<1, 1, 0> {
  public:
   explicit LDummyUse(LOperand* value) {