[clang] [clang] Implement `__builtin_is_implicit_lifetime()` (PR #101807)

[Mital Ashok via cfe-commits]

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@@ -86,6 +86,9 @@ C++23 Feature Support
 C++2c Feature Support
 ^^^^^^^^^^^^^^^^^^^^^
 
+- Add ``__builtin_is_implicit_lifetime`` intrinsic, which supports
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MitalAshok wrote:

Why is this called `__builtin_is_implicit_lifetime` instead of `__is_implicit_lifetime` like all the other unary type traits? I thought `__builtin_*` is for functions that return objects

https://github.com/llvm/llvm-project/pull/101807