[clang] [clang][Sema] Fix crash on atomic builtins with incomplete type args (PR #96374)

hazohelet wrote: Thanks for the feedback. `RequireCompleteType` seems like the right direction. I'm not writing about the crash fix to the release note because this crash was introduced AFTER clang 18 was released. https://github.com/llvm/llvm-project/pull/96374 ___

[clang] [clang][Sema] Fix crash on atomic builtins with incomplete type args (PR #96374)

https://github.com/hazohelet updated https://github.com/llvm/llvm-project/pull/96374 >From a655e6beb048aa0d6bde730f586d3261e43f69a6 Mon Sep 17 00:00:00 2001 From: Takuya Shimizu Date: Sat, 22 Jun 2024 12:05:50 +0900 Subject: [PATCH 1/2] [clang][Sema] Fix crash on atomic with incomplete type ar

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