[turbofan] Introduce a dedicated ConvertTaggedHoleToUndefined operator.

src/types.h

 // Copyright 2014 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef V8_TYPES_H_
 #define V8_TYPES_H_
 
 #include "src/conversions.h"
 #include "src/handles.h"
 #include "src/objects.h"
@@ skipping 181 matching lines @@
   V(MinusZero,           1u << 10 | REPRESENTATION(kTagged | kUntaggedNumber)) \
   V(NaN,                 1u << 11 | REPRESENTATION(kTagged | kUntaggedNumber)) \
   V(Symbol,              1u << 12 | REPRESENTATION(kTaggedPointer)) \
   V(InternalizedString,  1u << 13 | REPRESENTATION(kTaggedPointer)) \
   V(OtherString,         1u << 14 | REPRESENTATION(kTaggedPointer)) \
   V(Simd,                1u << 15 | REPRESENTATION(kTaggedPointer)) \
   V(OtherObject,         1u << 17 | REPRESENTATION(kTaggedPointer)) \
   V(OtherUndetectable,   1u << 16 | REPRESENTATION(kTaggedPointer)) \
   V(Proxy,               1u << 18 | REPRESENTATION(kTaggedPointer)) \
   V(Function,            1u << 19 | REPRESENTATION(kTaggedPointer)) \
-  V(Internal,            1u << 20 | REPRESENTATION(kTagged | kUntagged)) \
+  V(Hole,                1u << 20 | REPRESENTATION(kTaggedPointer)) \
+  V(OtherInternal,       1u << 21 | REPRESENTATION(kTagged | kUntagged)) \
   \
   V(Signed31,                   kUnsigned30 | kNegative31) \
   V(Signed32,                   kSigned31 | kOtherUnsigned31 | kOtherSigned32) \
   V(Signed32OrMinusZero,        kSigned32 | kMinusZero) \
   V(Signed32OrMinusZeroOrNaN,   kSigned32 | kMinusZero | kNaN) \
   V(Negative32,                 kNegative31 | kOtherSigned32) \
   V(Unsigned31,                 kUnsigned30 | kOtherUnsigned31) \
   V(Unsigned32,                 kUnsigned30 | kOtherUnsigned31 | \
                                 kOtherUnsigned32) \
   V(Unsigned32OrMinusZero,      kUnsigned32 | kMinusZero) \
   V(Unsigned32OrMinusZeroOrNaN, kUnsigned32 | kMinusZero | kNaN) \
   V(Integral32,                 kSigned32 | kUnsigned32) \
   V(PlainNumber,                kIntegral32 | kOtherNumber) \
   V(OrderedNumber,              kPlainNumber | kMinusZero) \
   V(MinusZeroOrNaN,             kMinusZero | kNaN) \
   V(Number,                     kOrderedNumber | kNaN) \
   V(String,                     kInternalizedString | kOtherString) \
   V(UniqueName,                 kSymbol | kInternalizedString) \
   V(Name,                       kSymbol | kString) \
   V(BooleanOrNumber,            kBoolean | kNumber) \
   V(BooleanOrNullOrNumber,      kBooleanOrNumber | kNull) \
   V(BooleanOrNullOrUndefined,   kBoolean | kNull | kUndefined) \
   V(NullOrNumber,               kNull | kNumber) \
   V(NullOrUndefined,            kNull | kUndefined) \
   V(Undetectable,               kNullOrUndefined | kOtherUndetectable) \
-  V(NumberOrOddball,            kNumber | kNullOrUndefined | kBoolean) \
+  V(NumberOrOddball,            kNumber | kNullOrUndefined | kBoolean | kHole) \
   V(NumberOrSimdOrString,       kNumber | kSimd | kString) \
   V(NumberOrString,             kNumber | kString) \
   V(NumberOrUndefined,          kNumber | kUndefined) \
   V(PlainPrimitive,             kNumberOrString | kBoolean | kNullOrUndefined) \
   V(Primitive,                  kSymbol | kSimd | kPlainPrimitive) \
   V(DetectableReceiver,         kFunction | kOtherObject | kProxy) \
   V(Object,                     kFunction | kOtherObject | kOtherUndetectable) \
   V(Receiver,                   kObject | kProxy) \
   V(StringOrReceiver,           kString | kReceiver) \
   V(Unique,                     kBoolean | kUniqueName | kNull | kUndefined | \
                                 kReceiver) \
+  V(Internal,                   kHole | kOtherInternal) \
   V(NonInternal,                kPrimitive | kReceiver) \
   V(NonNumber,                  kUnique | kString | kInternal) \
   V(Any,                        0xfffffffeu)
 
 // clang-format on
 
 /*
  * The following diagrams show how integers (in the mathematical sense) are
  * divided among the different atomic numerical types.
  *
@@ skipping 721 matching lines @@
 
   bool Narrows(Bounds that) {
     return that.lower->Is(this->lower) && this->upper->Is(that.upper);
   }
 };
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_TYPES_H_