Add static assert to ID Table to make sure aux targets work right.

I discovered that the limit on possible builtins managed by this
ObjCOrBuiltin variable is too low when combining large targets, since
aux-targets are appended to the targets list. A runtime assert exists
for this, however this patch creates a static-assert as well.

The logic for said static-assert is to make sure we have the room for
the aux-target and target to both be the largest list, which makes sure
we have room for all possible combinations.

I also incremented the number of bits by 1, since I discovered this
currently broken.  The current bit-count was 36, so this doesn't
increase any size.