Desugar bitwise negation into XOR and kill all UnaryOp stuff.

src/arm/lithium-codegen-arm.cc

Index: src/arm/lithium-codegen-arm.cc
diff --git a/src/arm/lithium-codegen-arm.cc b/src/arm/lithium-codegen-arm.cc
index 85e9cbb92a5786ec1cb7440b9af2e76af28ce966..c2daec0a469a0b6872f6972cf5482b36ae38c500 100644
--- a/src/arm/lithium-codegen-arm.cc
+++ b/src/arm/lithium-codegen-arm.cc
@@ -1669,7 +1669,11 @@ void LCodeGen::DoBitI(LBitI* instr) {
       __ orr(result, left, right);
       break;
     case Token::BIT_XOR:
-      __ eor(result, left, right);
+      if (right_op->IsConstantOperand() && right.immediate() == int32_t(~0)) {
+        __ mvn(result, Operand(left));
+      } else {
+        __ eor(result, left, right);
+      }
       break;
     default:
       UNREACHABLE();
@@ -1953,13 +1957,6 @@ void LCodeGen::DoSeqStringSetChar(LSeqStringSetChar* instr) {
 }
 
 
-void LCodeGen::DoBitNotI(LBitNotI* instr) {
-  Register input = ToRegister(instr->value());
-  Register result = ToRegister(instr->result());
-  __ mvn(result, Operand(input));
-}
-
-
 void LCodeGen::DoThrow(LThrow* instr) {
   Register input_reg = EmitLoadRegister(instr->value(), ip);
   __ push(input_reg);