[PATCH] aarch64: Use RTL builtins for [su]mull_high_n intrinsics

[Jonathan Wright]

Hi,

As subject, this patch rewrites [su]mull_high_n Neon intrinsics to use RTL
builtins rather than inline assembly code, allowing for better scheduling and
optimization.

Regression tested and bootstrapped on aarch64-none-linux-gnu and
aarch64_be-none-elf - no issues.

Ok for master?

Thanks,
Jonathan

---

gcc/ChangeLog:

2021-02-03  Jonathan Wright  <jonathan.wright@arm.com>

	* config/aarch64/aarch64-simd-builtins.def: Add [su]mull_hi_n
	builtin generator macros.
	* config/aarch64/aarch64-simd.md
	(aarch64_<su>mull_hi_n<mode>_insn): Define.
	(aarch64_<su>mull_hi_n<mode>): Define.
	* config/aarch64/arm_neon.h (vmull_high_n_s16): Use RTL builtin
	instead of inline asm.
	(vmull_high_n_s32): Likewise.
	(vmull_high_n_u16): Likewise.
	(vmull_high_n_u32): Likewise.
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