[clang] [analyzer] Modernize FuchsiaHandleChecker (PR #111588)

[Gábor Horváth via cfe-commits]

Xazax-hun wrote:

> The problem in our code is that function that releases a handle calls a syscall via macro, so it's not possible to directly annotate it. 

Ah, I see! Thanks for sharing! I think there are a couple potential workarounds here if you cannot change the macros:
* Use something like APINotes to inject annotations when parsing
* Make the check recognize the syscalls and consider them annotated.
* Make the check recognize the MACROs

I think in this particular case maybe the APINotes solution would make the most sense. See https://clang.llvm.org/docs/APINotes.html for details. 



https://github.com/llvm/llvm-project/pull/111588