Fix comment about AVX-512 popcount support.
Since commit f78667bd91, we've used __attribute__((target(...))) instead of extra compiler flags for AVX-512 support, but this comment still says that we put the code in a separate file because it might require extra compiler flags. Let's just remove that part of the comment.
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@ -307,9 +307,7 @@ extern PGDLLIMPORT uint64 (*pg_popcount_masked_optimized) (const char *buf, int
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/*
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* We can also try to use the AVX-512 popcount instruction on some systems.
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* The implementation of that is located in its own file because it may
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* require special compiler flags that we don't want to apply to any other
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* files.
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* The implementation of that is located in its own file.
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*/
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#ifdef USE_AVX512_POPCNT_WITH_RUNTIME_CHECK
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extern bool pg_popcount_avx512_available(void);
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