[libcxx] [llvm] [libc++] Fix CI issues recently introduced by localization changes (PR #116216)

[via llvm-commits]

llvmbot wrote:


<!--LLVM PR SUMMARY COMMENT-->

@llvm/pr-subscribers-libcxx

Author: Louis Dionne (ldionne)

<details>
<summary>Changes</summary>

After a recent Github Actions runner policy change [1], the version of Xcode included in
the macos-14 image went from Xcode 16 to Xcode 15, breaking our build bots.

This moves the bots to the macos 15 (public preview) image, which contains Xcode 16.

Also, adjust an UNSUPPORTED annotation that was incorrectly targeting macos 13.7
when it should have been targeting a version of AppleClang.

[1]: https://github.com/actions/runner-images/issues/10703

---
Full diff: https://github.com/llvm/llvm-project/pull/116216.diff


2 Files Affected:

- (modified) .github/workflows/libcxx-build-and-test.yaml (+4-4) 
- (modified) libcxx/test/std/experimental/simd/simd.class/simd_unary.pass.cpp (+2-3) 


``````````diff
diff --git a/.github/workflows/libcxx-build-and-test.yaml b/.github/workflows/libcxx-build-and-test.yaml
index 2184ddd49537b5..91b929732f2808 100644
--- a/.github/workflows/libcxx-build-and-test.yaml
+++ b/.github/workflows/libcxx-build-and-test.yaml
@@ -202,13 +202,13 @@ jobs:
       matrix:
         include:
         - config: generic-cxx03
-          os: macos-latest
+          os: macos-15
         - config: generic-cxx23
-          os: macos-latest
+          os: macos-15
         - config: generic-modules
-          os: macos-latest
+          os: macos-15
         - config: apple-configuration
-          os: macos-latest
+          os: macos-15
         - config: apple-system
           os: macos-13
         - config: apple-system-hardened
diff --git a/libcxx/test/std/experimental/simd/simd.class/simd_unary.pass.cpp b/libcxx/test/std/experimental/simd/simd.class/simd_unary.pass.cpp
index 8cc9924a3cdae1..17ecfd3b50d255 100644
--- a/libcxx/test/std/experimental/simd/simd.class/simd_unary.pass.cpp
+++ b/libcxx/test/std/experimental/simd/simd.class/simd_unary.pass.cpp
@@ -12,9 +12,8 @@
 //   Pass-by-value arguments with alignment greater than register width are not supported.
 // XFAIL: target=powerpc{{.*}}-ibm-{{.*}} && (clang-17 || clang-18)
 
-// FIXME: The following issue occurs on macOS 13.7 with Apple clang 15.0.0:
-//   clang: error: unable to execute command: Illegal instruction: 4
-// XFAIL: target=x86_64-apple-macosx13.7
+// This test crashes AppleClang 15 but not later versions.
+// UNSUPPORTED: apple-clang-15
 
 // FIXME: The following issue occurs on Windows to Armv7 Ubuntu Linux:
 //   Assertion failed: N->getValueType(0) == MVT::v1i1 && "Expected v1i1 type"

``````````

</details>


https://github.com/llvm/llvm-project/pull/116216