[clang] Add REQUIRES: x86-registered-target to test added in #173311. (PR #178271)

[Eli Friedman via cfe-commits]

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@@ -3,6 +3,8 @@
 // RUN: %clang -target x86_64-apple-darwin -emit-llvm -S -o - %s -fstack-protector-all | FileCheck %s
 // RUN: %clang -target x86_64-apple-darwin -Xclang -verify -fstack-protector-all %s -o %t -c
 
+// REQUIRES: x86-reigstered-target
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efriedma-quic wrote:

Can we instead change the second RUN line to use -emit-llvm, or something like that?  This test shouldn't actually require the backend,

https://github.com/llvm/llvm-project/pull/178271