Desugar bitwise negation into XOR and kill all UnaryOp stuff.

src/mips/lithium-mips.cc

Index: src/mips/lithium-mips.cc
diff --git a/src/mips/lithium-mips.cc b/src/mips/lithium-mips.cc
index 5adcff240952218b6997308537e5a2e334b01815..38ac19f609c2d8e4294b73a32f86efa78ae81db7 100644
--- a/src/mips/lithium-mips.cc
+++ b/src/mips/lithium-mips.cc
@@ -1327,15 +1327,6 @@ 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* value = UseRegisterAtStart(instr->value());
-  return DefineAsRegister(new(zone()) LBitNotI(value));
-}
-
-
 LInstruction* LChunkBuilder::DoDiv(HDiv* instr) {
   if (instr->representation().IsDouble()) {
     return DoArithmeticD(Token::DIV, instr);