[clang] nolock/noalloc attributes (PR #84983)

[via cfe-commits]

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+// RUN: %clang_cc1 -fsyntax-only -fblocks -verify %s
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Sirraide wrote:

It’s usually not required to separate code that errors and code that is supposed to compile without errors, but if it is required for something like this, then sure, go ahead.

>  -parsing, -sema, -constraints.

Well, *parsing*-related tests should probably go in `test/Parser` (from what I’ve seen so far, you also haven’t made any changes in the parser, though).

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