[AArch64] Add a big-endian lane flip at expand-time in saturating math patterns.

[AArch64] Add a big-endian lane flip at expand-time in saturating math patterns.

	* config/aarch64/aarch64-simd.md (aarch64_sqdmulh_lane<mode>):
	New expander.
	(aarch64_sqrdmulh_lane<mode>): Likewise.
	(aarch64_sq<r>dmulh_lane<mode>): Rename to...
	(aarch64_sq<r>dmulh_lane<mode>_internal): ...this.
	(aarch64_sqdmulh_laneq<mode>): New expander.
	(aarch64_sqrdmulh_laneq<mode>): Likewise.
	(aarch64_sq<r>dmulh_laneq<mode>): Rename to...
	(aarch64_sq<r>dmulh_laneq<mode>_internal): ...this.
	(aarch64_sqdmulh_lane<mode>): New expander.
	(aarch64_sqrdmulh_lane<mode>): Likewise.
	(aarch64_sq<r>dmulh_lane<mode>): Rename to...
	(aarch64_sq<r>dmulh_lane<mode>_internal): ...this.
	(aarch64_sqdmlal_lane<mode>): Add lane flip for big-endian.
	(aarch64_sqdmlal_laneq<mode>): Likewise.
	(aarch64_sqdmlsl_lane<mode>): Likewise.
	(aarch64_sqdmlsl_laneq<mode>): Likewise.
	(aarch64_sqdmlal2_lane<mode>): Likewise.
	(aarch64_sqdmlal2_laneq<mode>): Likewise.
	(aarch64_sqdmlsl2_lane<mode>): Likewise.
	(aarch64_sqdmlsl2_laneq<mode>): Likewise.
	(aarch64_sqdmull_lane<mode>): Likewise.
	(aarch64_sqdmull_laneq<mode>): Likewise.
	(aarch64_sqdmull2_lane<mode>): Likewise.
	(aarch64_sqdmull2_laneq<mode>): Likewise.

git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@211414 138bc75d-0d04-0410-961f-82ee72b054a4