[turbofan] Introduce CheckHole and CheckHoleNaN operators.

src/compiler/opcodes.h

 // Copyright 2013 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_COMPILER_OPCODES_H_
 #define V8_COMPILER_OPCODES_H_
 
 #include <iosfwd>
 
 // Opcodes for control operators.
@@ skipping 189 matching lines @@
   V(NumberFround)                  \
   V(NumberAtan)                    \
   V(NumberAtan2)                   \
   V(NumberLog)                     \
   V(NumberLog1p)                   \
   V(NumberRound)                   \
   V(NumberSqrt)                    \
   V(NumberTrunc)                   \
   V(NumberToInt32)                 \
   V(NumberToUint32)                \
-  V(NumberIsHoleNaN)               \
   V(NumberSilenceNaN)              \
-  V(NumberConvertHoleNaN)          \
   V(StringFromCharCode)            \
   V(StringToNumber)                \
   V(ChangeTaggedSignedToInt32)     \
   V(ChangeTaggedToInt32)           \
   V(ChangeTaggedToUint32)          \
   V(ChangeTaggedToFloat64)         \
   V(ChangeInt31ToTaggedSigned)     \
   V(ChangeInt32ToTagged)           \
   V(ChangeUint32ToTagged)          \
   V(ChangeFloat64ToTagged)         \
   V(ChangeTaggedToBit)             \
   V(ChangeBitToTagged)             \
   V(CheckedUint32ToInt32)          \
   V(CheckedFloat64ToInt32)         \
   V(CheckedTaggedToInt32)          \
   V(CheckedTaggedToFloat64)        \
+  V(CheckHole)                     \
+  V(CheckHoleNaN)                  \

[Jarin, 2016/06/15 11:18:43]

How about somehow making more explicit the representation? (The former checks
tagged hole, the latter float64 hole nan, no?)

CheckTaggedHole, CheckFloat64HoleNaN?

[Benedikt Meurer, 2016/06/15 11:39:09]

Done.

   V(CheckIf)                       \
   V(TruncateTaggedToWord32)        \
   V(TruncateTaggedToFloat64)       \
   V(Allocate)                      \
   V(LoadField)                     \
   V(LoadBuffer)                    \
   V(LoadElement)                   \
   V(StoreField)                    \
   V(StoreBuffer)                   \
   V(StoreElement)                  \
@@ skipping 419 matching lines @@
   }
 };
 
 std::ostream& operator<<(std::ostream&, IrOpcode::Value);
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_COMPILER_OPCODES_H_