Desugar bitwise negation into XOR and kill all UnaryOp stuff.

src/ia32/lithium-codegen-ia32.cc

Index: src/ia32/lithium-codegen-ia32.cc
diff --git a/src/ia32/lithium-codegen-ia32.cc b/src/ia32/lithium-codegen-ia32.cc
index 9ef49e7e582c9442854361005cac0dbd3854dc72..75d385c86535e425f127024909aeb2da07cc2844 100644
--- a/src/ia32/lithium-codegen-ia32.cc
+++ b/src/ia32/lithium-codegen-ia32.cc
@@ -1679,8 +1679,9 @@ void LCodeGen::DoBitI(LBitI* instr) {
   ASSERT(left->IsRegister());
 
   if (right->IsConstantOperand()) {
-    int right_operand = ToRepresentation(LConstantOperand::cast(right),
-                                         instr->hydrogen()->representation());
+    int32_t right_operand =
+        ToRepresentation(LConstantOperand::cast(right),
+                         instr->hydrogen()->representation());
     switch (instr->op()) {
       case Token::BIT_AND:
         __ and_(ToRegister(left), right_operand);
@@ -1689,7 +1690,11 @@ void LCodeGen::DoBitI(LBitI* instr) {
         __ or_(ToRegister(left), right_operand);
         break;
       case Token::BIT_XOR:
-        __ xor_(ToRegister(left), right_operand);
+        if (right_operand == int32_t(~0)) {
+          __ not_(ToRegister(left));
+        } else {
+          __ xor_(ToRegister(left), right_operand);
+        }
         break;
       default:
         UNREACHABLE();
@@ -1990,13 +1995,6 @@ void LCodeGen::DoSeqStringSetChar(LSeqStringSetChar* instr) {
 }
 
 
-void LCodeGen::DoBitNotI(LBitNotI* instr) {
-  LOperand* input = instr->value();
-  ASSERT(input->Equals(instr->result()));
-  __ not_(ToRegister(input));
-}
-
-
 void LCodeGen::DoThrow(LThrow* instr) {
   __ push(ToOperand(instr->value()));
   ASSERT(ToRegister(instr->context()).is(esi));