Desugar bitwise negation into XOR and kill all UnaryOp stuff.

src/x64/lithium-x64.h

Index: src/x64/lithium-x64.h
diff --git a/src/x64/lithium-x64.h b/src/x64/lithium-x64.h
index 6716f484779817b89cca34cf416ba6de069ba5f7..c3b9db4c592461f6afa3b2137fe54e3f8e283642 100644
--- a/src/x64/lithium-x64.h
+++ b/src/x64/lithium-x64.h
@@ -50,7 +50,6 @@ class LCodeGen;
   V(ArithmeticD)                                \
   V(ArithmeticT)                                \
   V(BitI)                                       \
-  V(BitNotI)                                    \
   V(BoundsCheck)                                \
   V(Branch)                                     \
   V(CallConstantFunction)                       \
@@ -1311,18 +1310,6 @@ class LThrow: public LTemplateInstruction<0, 1, 0> {
 };
 
 
-class LBitNotI: public LTemplateInstruction<1, 1, 0> {
- public:
-  explicit LBitNotI(LOperand* value) {
-    inputs_[0] = value;
-  }
-
-  LOperand* value() { return inputs_[0]; }
-
-  DECLARE_CONCRETE_INSTRUCTION(BitNotI, "bit-not-i")
-};
-
-
 class LAddI: public LTemplateInstruction<1, 2, 0> {
  public:
   LAddI(LOperand* left, LOperand* right) {