[runtime] Introduce dedicated JSBoundFunction to represent bound functions.

src/bailout-reason.h

Index: src/bailout-reason.h
diff --git a/src/bailout-reason.h b/src/bailout-reason.h
index 535580f11d5f34b2b6936b284a223e029a899d5e..83898d12bf762c863efaf2fb55997259415e0a54 100644
--- a/src/bailout-reason.h
+++ b/src/bailout-reason.h
@@ -146,11 +146,14 @@ namespace internal {
   V(kObjectFoundInSmiOnlyArray, "Object found in smi-only array")              \
   V(kObjectLiteralWithComplexProperty, "Object literal with complex property") \
   V(kOffsetOutOfRange, "Offset out of range")                                  \
+  V(kOperandIsASmiAndNotABoundFunction,                                        \
+    "Operand is a smi and not a bound function")                               \
   V(kOperandIsASmiAndNotAFunction, "Operand is a smi and not a function")      \
   V(kOperandIsASmiAndNotAName, "Operand is a smi and not a name")              \
   V(kOperandIsASmiAndNotAString, "Operand is a smi and not a string")          \
   V(kOperandIsASmi, "Operand is a smi")                                        \
   V(kOperandIsNotADate, "Operand is not a date")                               \
+  V(kOperandIsNotABoundFunction, "Operand is not a bound function")            \
   V(kOperandIsNotAFunction, "Operand is not a function")                       \
   V(kOperandIsNotAName, "Operand is not a name")                               \
   V(kOperandIsNotANumber, "Operand is not a number")                           \