[stubs] Gets rid of the Smi(Add/Sub)WithOverflow macros.

src/code-stub-assembler.cc

Index: src/code-stub-assembler.cc
diff --git a/src/code-stub-assembler.cc b/src/code-stub-assembler.cc
index a72e267f391581a840defb56e0dfe7e5b25a3dc7..d3dbee7f8a2d6927ad2c0378410be422d0c1d8f3 100644
--- a/src/code-stub-assembler.cc
+++ b/src/code-stub-assembler.cc
@@ -296,19 +296,11 @@ Node* CodeStubAssembler::SmiAdd(Node* a, Node* b) {
       IntPtrAdd(BitcastTaggedToWord(a), BitcastTaggedToWord(b)));
 }
 
-Node* CodeStubAssembler::SmiAddWithOverflow(Node* a, Node* b) {
-  return IntPtrAddWithOverflow(BitcastTaggedToWord(a), BitcastTaggedToWord(b));
-}
-
 Node* CodeStubAssembler::SmiSub(Node* a, Node* b) {
   return BitcastWordToTaggedSigned(
       IntPtrSub(BitcastTaggedToWord(a), BitcastTaggedToWord(b)));
 }
 
-Node* CodeStubAssembler::SmiSubWithOverflow(Node* a, Node* b) {
-  return IntPtrSubWithOverflow(BitcastTaggedToWord(a), BitcastTaggedToWord(b));
-}
-
 Node* CodeStubAssembler::SmiEqual(Node* a, Node* b) {
   return WordEqual(BitcastTaggedToWord(a), BitcastTaggedToWord(b));
 }