[libcxx-commits] [libcxx] [libcxxabi] [llvm] [libc++] Update to Clang 21 as the oldest supported version (PR #186062)

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<!--LLVM CODE FORMAT COMMENT: {clang-format}-->


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``````````bash
git-clang-format --diff origin/main HEAD --extensions cpp,h -- libcxx/include/__configuration/compiler.h libcxx/test/std/atomics/atomics.types.generic/cas_non_power_of_2.pass.cpp libcxxabi/src/cxa_default_handlers.cpp --diff_from_common_commit
``````````

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View the diff from clang-format here.
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``````````diff
diff --git a/libcxxabi/src/cxa_default_handlers.cpp b/libcxxabi/src/cxa_default_handlers.cpp
index 092e66692..e16d865bb 100644
--- a/libcxxabi/src/cxa_default_handlers.cpp
+++ b/libcxxabi/src/cxa_default_handlers.cpp
@@ -81,8 +81,8 @@ static void demangling_terminate_handler()
 __attribute__((noreturn))
 static void demangling_terminate_handler()
 {
-    (void)cause;
-    __abort_message("terminating");
+  (void)cause;
+  __abort_message("terminating");
 }
 #endif // !_LIBCXXABI_NO_EXCEPTIONS
 

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https://github.com/llvm/llvm-project/pull/186062