[clang] [clang] Implement gcc_struct attribute on Itanium targets (PR #71148)

[Dan Klishch via cfe-commits]

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In-Reply-To: <llvm.org/llvm/llvm-project/pull/71148 at github.com>


DanShaders wrote:

Hmm, it looks like the previous behavior was a bug: with `x86_64-windows-gnu`, clang should be in `-mms-bitfields` mode (with `sizeof(struct nS) == 16`) but we don't choose first branch either with or without the patch.

https://github.com/llvm/llvm-project/pull/71148