[stubs] Split ToNumberStub into reusable subparts.

src/bailout-reason.h

Index: src/bailout-reason.h
diff --git a/src/bailout-reason.h b/src/bailout-reason.h
index b56980e8e8eb84cf68f5cdd1949859783e583d23..188b15890435df1dff406a9e919f1068ffe1ad05 100644
--- a/src/bailout-reason.h
+++ b/src/bailout-reason.h
@@ -139,6 +139,7 @@ namespace internal {
   V(kObjectFoundInSmiOnlyArray, "Object found in smi-only array")              \
   V(kObjectLiteralWithComplexProperty, "Object literal with complex property") \
   V(kOffsetOutOfRange, "Offset out of range")                                  \
+  V(kOperandIsANumber, "Operand is a number")                                  \
   V(kOperandIsASmiAndNotABoundFunction,                                        \
     "Operand is a smi and not a bound function")                               \
   V(kOperandIsASmiAndNotAFunction, "Operand is a smi and not a function")      \