[PATCH] gcc: middle-end opt for trigonometric pi-based functions builtins

[Yuao Ma]

Hi all,

This patch has been updated to conditionally fold the specified math functions
only when using MPFR version 4.2.0 or newer.

To accompany this change, the test case now utilizes `__builtin_constant_p` to
determine whether to execute the tests against the folded functions.

Let me know if this patch needs further modifications!

Best regards,
Yuao

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