[turbofan] Introduce TruncateTaggedToWord32 simplified operator.

src/compiler/code-assembler.cc

Index: src/compiler/code-assembler.cc
diff --git a/src/compiler/code-assembler.cc b/src/compiler/code-assembler.cc
index b93ece1bcc1aaaadcf636053b61bc5d4ba05f15d..6a829b2661e1b0d8d73c24d1f875afe14c7cc031 100644
--- a/src/compiler/code-assembler.cc
+++ b/src/compiler/code-assembler.cc
@@ -160,15 +160,6 @@ Node* CodeAssembler::WordShl(Node* value, int shift) {
   return raw_assembler_->WordShl(value, IntPtrConstant(shift));
 }
 
-Node* CodeAssembler::TruncateFloat64ToInt32RoundToZero(Node* a) {
-  return raw_assembler_->TruncateFloat64ToInt32(TruncationMode::kRoundToZero,
-                                                a);
-}
-
-Node* CodeAssembler::TruncateFloat64ToInt32JavaScript(Node* a) {
-  return raw_assembler_->TruncateFloat64ToInt32(TruncationMode::kJavaScript, a);
-}
-
 Node* CodeAssembler::ChangeUint32ToWord(Node* value) {
   if (raw_assembler_->machine()->Is64()) {
     value = raw_assembler_->ChangeUint32ToUint64(value);