[clang] [Sema] Fix ICE due to incorrect _Bool handling in format string checking (PR #174684)

[Leandro Lupori via cfe-commits]

luporl wrote:

This PR broke 32-bit Arm buildbots:
- https://lab.llvm.org/buildbot/#/builders/154/builds/26963
- https://lab.llvm.org/buildbot/#/builders/79/builds/2781
- https://lab.llvm.org/buildbot/#/builders/135/builds/3109
- https://lab.llvm.org/buildbot/#/builders/39/builds/9763

It appears that `size_t` and `ptrdiff_t` should only be tested if their size is greater than the size of `int`.

https://github.com/llvm/llvm-project/pull/174684