Desugar bitwise negation into XOR and kill all UnaryOp stuff.

src/x64/lithium-x64.cc

Index: src/x64/lithium-x64.cc
diff --git a/src/x64/lithium-x64.cc b/src/x64/lithium-x64.cc
index 6be237351c5dafa7fa3e239f6aaedb47235832ea..913e170595d4d9a9d2ac4dd4eefbecc88fbc70fa 100644
--- a/src/x64/lithium-x64.cc
+++ b/src/x64/lithium-x64.cc
@@ -1321,16 +1321,6 @@ LInstruction* LChunkBuilder::DoBitwise(HBitwise* instr) {
 }
 
 
-LInstruction* LChunkBuilder::DoBitNot(HBitNot* instr) {
-  ASSERT(instr->value()->representation().IsInteger32());
-  ASSERT(instr->representation().IsInteger32());
-  if (instr->HasNoUses()) return NULL;
-  LOperand* input = UseRegisterAtStart(instr->value());
-  LBitNotI* result = new(zone()) LBitNotI(input);
-  return DefineSameAsFirst(result);
-}
-
-
 LInstruction* LChunkBuilder::DoDiv(HDiv* instr) {
   if (instr->representation().IsDouble()) {
     return DoArithmeticD(Token::DIV, instr);