[clang] [AST] Bump Type::NumOfBuiltinTypeBits. NFCI. (PR #113559)

[Aaron Ballman via cfe-commits]

AaronBallman wrote:

> > The community doesn't add new builtin types particularly often, so having four leftover bits isn't actually that close to the limit for us.
> 
> I guess "close" is subjective.
> 
> > Is there a problem with keeping this change downstream until we get to the limit in community?
> 
> No, I was just trying to separate out some changes that seemed upstreamable.

Ah! I appreciate the effort, but yeah, this one may cause more questions like "why are we using 10 bits when we only need 9?" while folks review code. Otherwise, it is harmless (it doesn't seem to increase the size of anything, so it's not adding extra memory pressure anywhere).

https://github.com/llvm/llvm-project/pull/113559