[AArch64] PR rtl-optimization/68796: Add patterns for QImode and HImode comparison...

[AArch64] PR rtl-optimization/68796: Add patterns for QImode and HImode comparison with zero

	PR rtl-optimization/68796
	* config/aarch64/aarch64.md (*and<mode>_compare0): New pattern.
	* config/aarch64/aarch64.c (aarch64_select_cc_mode): Handle HImode
	and QImode comparisons against zero with CC_NZmode.
	* config/aarch64/iterators.md (short_mask): New mode_attr.

	* gcc.target/aarch64/tst_5.c: New test.
	* gcc.target/aarch64/tst_6.c: Likewise.

From-SVN: r232228