[libcxx-commits] [libcxx] [libc++] Add [[clang::lifetimebound]] to std::identity (PR #165854)

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``````````bash
git-clang-format --diff origin/main HEAD --extensions h,cpp -- libcxx/test/libcxx/utilities/function.objects/lifetimebound.verify.cpp libcxx/include/__functional/identity.h --diff_from_common_commit
``````````

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View the diff from clang-format here.
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``````````diff
diff --git a/libcxx/test/libcxx/utilities/function.objects/lifetimebound.verify.cpp b/libcxx/test/libcxx/utilities/function.objects/lifetimebound.verify.cpp
index 0ca6007de..74e152c54 100644
--- a/libcxx/test/libcxx/utilities/function.objects/lifetimebound.verify.cpp
+++ b/libcxx/test/libcxx/utilities/function.objects/lifetimebound.verify.cpp
@@ -14,5 +14,6 @@
 #include "test_macros.h"
 
 void func() {
-  auto&& v1 = std::identity()(1); // expected-warning {{temporary bound to local reference 'v1' will be destroyed at the end of the full-expression}}
+  auto&& v1 = std::identity()(
+      1); // expected-warning {{temporary bound to local reference 'v1' will be destroyed at the end of the full-expression}}
 }

``````````

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https://github.com/llvm/llvm-project/pull/165854