Remove HIsNilAndBranch (it's now unused)

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 7dcb50e274f74fe1126f57d38513f450301b7fb2..4f8eecdb472c224d47738c2def2df0bcfd5fefaf 100644
--- a/src/mips/lithium-mips.h
+++ b/src/mips/lithium-mips.h
@@ -113,7 +113,6 @@ class LCodeGen;
   V(Uint32ToDouble)                             \
   V(InvokeFunction)                             \
   V(IsConstructCallAndBranch)                   \
-  V(IsNilAndBranch)                             \
   V(IsObjectAndBranch)                          \
   V(IsStringAndBranch)                          \
   V(IsSmiAndBranch)                             \
@@ -847,24 +846,6 @@ class LCmpConstantEqAndBranch: public LControlInstruction<1, 0> {
 };
 
 
-class LIsNilAndBranch: public LControlInstruction<1, 0> {
- public:
-  explicit LIsNilAndBranch(LOperand* value) {
-    inputs_[0] = value;
-  }
-
-  LOperand* value() { return inputs_[0]; }
-
-  DECLARE_CONCRETE_INSTRUCTION(IsNilAndBranch, "is-nil-and-branch")
-  DECLARE_HYDROGEN_ACCESSOR(IsNilAndBranch)
-
-  EqualityKind kind() const { return hydrogen()->kind(); }
-  NilValue nil() const { return hydrogen()->nil(); }
-
-  virtual void PrintDataTo(StringStream* stream);
-};
-
-
 class LIsObjectAndBranch: public LControlInstruction<1, 1> {
  public:
   LIsObjectAndBranch(LOperand* value, LOperand* temp) {