[turbofan] Introduce a dedicated CheckBounds operator.

src/compiler/simplified-operator.cc

Index: src/compiler/simplified-operator.cc
diff --git a/src/compiler/simplified-operator.cc b/src/compiler/simplified-operator.cc
index d85d310cd7bcf06f9502c56ec2d4e9f45bde3b93..9e2ebafdfa6e6cdf3f750b8691e3204e13313667 100644
--- a/src/compiler/simplified-operator.cc
+++ b/src/compiler/simplified-operator.cc
@@ -423,6 +423,12 @@ const Operator* SimplifiedOperatorBuilder::ReferenceEqual(Type* type) {
                                "ReferenceEqual", 2, 0, 0, 1, 0, 0);
 }
 
+const Operator* SimplifiedOperatorBuilder::CheckBounds() {
+  // TODO(bmeurer): Cache this operator. Make it pure!
+  return new (zone()) Operator(IrOpcode::kCheckBounds, Operator::kEliminatable,
+                               "CheckBounds", 2, 1, 1, 1, 1, 0);
+}
+
 const Operator* SimplifiedOperatorBuilder::TypeGuard(Type* type) {
   class TypeGuardOperator final : public Operator1<Type*> {
    public: