[turbofan] Introduce CheckHole and CheckHoleNaN operators.

src/compiler/typer.cc

Index: src/compiler/typer.cc
diff --git a/src/compiler/typer.cc b/src/compiler/typer.cc
index c0d7ae664002304fc409eed80bdd8a77744648d0..165779bad5285375c97847c2b24bc91d7b439b01 100644
--- a/src/compiler/typer.cc
+++ b/src/compiler/typer.cc
@@ -248,7 +248,6 @@ class Typer::Visitor : public Reducer {
   static Type* NumberTrunc(Type*, Typer*);
   static Type* NumberToInt32(Type*, Typer*);
   static Type* NumberToUint32(Type*, Typer*);
-  static Type* NumberConvertHoleNaN(Type*, Typer*);
 
   static Type* ObjectIsCallable(Type*, Typer*);
   static Type* ObjectIsNumber(Type*, Typer*);
@@ -557,10 +556,6 @@ Type* Typer::Visitor::NumberToUint32(Type* type, Typer* t) {
   return Type::Unsigned32();
 }
 
-Type* Typer::Visitor::NumberConvertHoleNaN(Type* type, Typer* t) {
-  return Type::Union(type, Type::Undefined(), t->zone());
-}
-
 // Type checks.
 
 Type* Typer::Visitor::ObjectIsCallable(Type* type, Typer* t) {
@@ -1818,14 +1813,6 @@ Type* Typer::Visitor::TypeNumberToUint32(Node* node) {
 }
 
 
-Type* Typer::Visitor::TypeNumberIsHoleNaN(Node* node) {
-  return Type::Boolean();
-}
-
-Type* Typer::Visitor::TypeNumberConvertHoleNaN(Node* node) {
-  return TypeUnaryOp(node, NumberConvertHoleNaN);
-}
-
 // static
 Type* Typer::Visitor::ReferenceEqualTyper(Type* lhs, Type* rhs, Typer* t) {
   if (lhs->IsConstant() && rhs->Is(lhs)) {
@@ -1974,6 +1961,29 @@ Type* Typer::Visitor::TypeCheckedTaggedToFloat64(Node* node) {
   return Type::Number();
 }
 
+Type* Typer::Visitor::TypeCheckFloat64Hole(Node* node) {
+  Type* type = Operand(node, 0);
+  return type;
+}
+
+Type* Typer::Visitor::TypeCheckTaggedHole(Node* node) {
+  CheckTaggedHoleMode mode = CheckTaggedHoleModeOf(node->op());
+  Type* type = Operand(node, 0);
+  type = Type::Intersect(type, Type::NonInternal(), zone());
+  switch (mode) {
+    case CheckTaggedHoleMode::kConvertHoleToUndefined: {
+      // The hole is turned into undefined.
+      type = Type::Union(type, Type::Undefined(), zone());
+      break;
+    }
+    case CheckTaggedHoleMode::kNeverReturnHole: {
+      // We deoptimize in case of the hole.
+      break;
+    }
+  }
+  return type;
+}
+
 Type* Typer::Visitor::TypeCheckIf(Node* node) {
   UNREACHABLE();
   return nullptr;