Nikolas Klauser 84d4037488 Reapply "[libc++] Fix tests for clang::no_specializations for C++17 and C++20"
The missing diagnostic pragmas have been added.

This reverts commit 8a6b44bf4cfe5df3db687a6b9519e99dbce8cf54.
2025-01-25 10:26:15 +01:00
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