[PR66791][ARM] Replace calls to __builtin_neon_vmvn* by ~ for vmvn intrinsics

[Prathamesh Kulkarni via Gcc-patches]

Hi,
This patch replaces calls to __builtin_neon_vmvnv* builtins with ~
operator in arm_neon.h.
Cross-tested on arm*-*-*.
OK to commit ?

Thanks,
Prathamesh

vmvn-1.diff
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