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c44fa3e8a9
This is a followup to #81014 and #84582: Before this patch, Clang would accept `__attribute__((assume))` and `[[clang::assume]]` as nonstandard spellings for the `[[omp::assume]]` attribute; this resulted in a potentially very confusing name clash with C++23’s `[[assume]]` attribute (and GCC’s `assume` attribute with the same semantics). This pr replaces every usage of `__attribute__((assume))` with `[[omp::assume]]` and makes `__attribute__((assume))` and `[[clang::assume]]` alternative spellings for C++23’s `[[assume]]`; this shouldn’t cause any problems due to differences in appertainment and because almost no-one was using this variant spelling to begin with (a use in libclc has already been changed to use a different attribute).