[clang] [libcxx] [Clang] Add __builtin_common_reference (PR #121199)

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@@ -145,8 +160,6 @@ struct __common_reference_sub_bullet1<_Tp, _Up> {
 
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huixie90 wrote:

The origin line 156 does not match the new builtin implementation. the pointer bit is missing as P2655R3 is not implemented . do we have a test?

https://github.com/llvm/llvm-project/pull/121199