[clang] [CIR][ABI] Add _BitInt flag to IntType (PR #188113)

[Henrich Lauko via cfe-commits]

xlauko wrote:

> Side note: WDYT about the comment I made about `Fundamental` type above? I realize my comment seemed to have caused the merge to happen automatically, but I was a bit surprised it didn't come up before.

I agree with you there we should consolidate it. Depends what we mean by `fundamental` type even, I guess we should follow standard and what AST/fronend considers fundamental type:

- According to core wording of  https://www.open-std.org/jtc1/sc22/wg21/docs/papers/2026/p3666r3.html it will be considered fundamental.

- AST: https://github.com/llvm/llvm-project/blob/73e2b0e64186e2386d777e936c92bb25a995a0f4/clang/include/clang/AST/TypeBase.h#L8631


https://github.com/llvm/llvm-project/pull/188113