[PR66791][ARM] Replace __builtin_neon_vneg* by - for vneg intrinsics

[Prathamesh Kulkarni via Gcc-patches]

Hi,
This patch replaces calls to __builtin_neon_vneg* builtins by -
operator, for vneg intrinsics in arm_neon.h.
Cross-tested on arm*-*-*.
OK to commit ?

Thanks,
Prathamesh

vneg-1.diff
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