[turbofan] introduce Int32/64AbsWithOverflow optional operator

src/compiler/mips/instruction-selector-mips.cc

Index: src/compiler/mips/instruction-selector-mips.cc
diff --git a/src/compiler/mips/instruction-selector-mips.cc b/src/compiler/mips/instruction-selector-mips.cc
index a3cbfad548f29a3c934b0cac954386d5f3ac2f37..6454d126c5480b0469c15fc9691528ec7d1259d9 100644
--- a/src/compiler/mips/instruction-selector-mips.cc
+++ b/src/compiler/mips/instruction-selector-mips.cc
@@ -1891,6 +1891,14 @@ void InstructionSelector::VisitAtomicCompareExchange(Node* node) {
   UNIMPLEMENTED();
 }
 
+void InstructionSelector::VisitInt32AbsWithOverflow(Node* node) {
+  UNREACHABLE();
+}
+
+void InstructionSelector::VisitInt64AbsWithOverflow(Node* node) {
+  UNREACHABLE();
+}
+
 // static
 MachineOperatorBuilder::Flags
 InstructionSelector::SupportedMachineOperatorFlags() {