[clang] nonblocking/nonallocating attributes (was: nolock/noalloc) (PR #84983)

[Doug Wyatt via cfe-commits]

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+// RUN: %clang_cc1 -fsyntax-only -fblocks -fcxx-exceptions -verify %s
+// RUN: %clang_cc1 -fsyntax-only -fblocks -verify -x c -std=c23 %s
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dougsonos wrote:

There's now a separate file for pre-C23 - currently it just tests the prototypeless case.

I'm having trouble thinking of more things to test for pre-C23 that are different from what's covered in this file for C23.

https://github.com/llvm/llvm-project/pull/84983