arm/PR66791: Replace calls to vtst builtin with it's boolean logic equivalent.

arm/PR66791: Replace calls to vtst builtin with it's boolean logic equivalent.

gcc/ChangeLog:

2021-05-14  Prathamesh Kulkarni  <prathamesh.kulkarni@linaro.org>

	PR target/66791
	* config/arm/arm_neon.h (vtst_s8): Replace call to vtst builtin with it's
	boolean logic equivalent.
	(vtst_s16): Likewise.
	(vtst_s32): Likewise.
	(vtst_u8): Likewise.
	(vtst_u16): Likewise.
	(vtst_u32): Likewise.
	(vtst_p8): Likewise.
	(vtst_p16): Likewise.
	(vtstq_s8): Likewise.
	(vtstq_s16): Likewise.
	(vtstq_s32): Likewise.
	(vtstq_u8): Likewise.
	(vtstq_u16): Likewise.
	(vtstq_u32): Likewise.
	(vtstq_p8): Likewise.
	(vtstq_p16): Likewise.

	* config/arm/arm_neon_builtins.def: Remove entry for vtst.
	* config/arm/neon.md (neon_vtst<mode>): Remove pattern.