[PR66791][ARM] Replace __builtin_neon_vtst*

[Prathamesh Kulkarni via Gcc-patches]

Hi,
The attached patch replaces __builtin_neon_vtst* (a, b) with (a & b) != 0.
Bootstrapped and tested on arm-linux-gnueabihf and cross-tested on arm*-*-*.
OK to commit ?

Thanks,
Prathamesh

vtst-1.diff
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