[turbofan] Introduce CheckHole and CheckHoleNaN operators.

src/compiler/opcodes.h

Index: src/compiler/opcodes.h
diff --git a/src/compiler/opcodes.h b/src/compiler/opcodes.h
index 5f41338ec3e299b500e54db5e0bea5087f934ab6..7e200ff3d4c6e55499111dbf63e10a0244c8d6e1 100644
--- a/src/compiler/opcodes.h
+++ b/src/compiler/opcodes.h
@@ -207,9 +207,7 @@
   V(NumberTrunc)                   \
   V(NumberToInt32)                 \
   V(NumberToUint32)                \
-  V(NumberIsHoleNaN)               \
   V(NumberSilenceNaN)              \
-  V(NumberConvertHoleNaN)          \
   V(StringFromCharCode)            \
   V(StringToNumber)                \
   V(ChangeTaggedSignedToInt32)     \
@@ -226,6 +224,8 @@
   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)       \