[APX NDD] Support TImode shift for NDD

[APX NDD] Support TImode shift for NDD

For TImode shifts, they are splitted by splitter functions, which assume
operands[0] and operands[1] to be the same. For the NDD alternative the
assumption may not be true so add split functions for NDD to emit the NDD
form instructions, and omit the handling of !64bit target split.

Although the NDD form allows memory src, for post-reload splitter there are
no extra register to accept NDD form shift, especially shld/shrd. So only
accept register alternative for shift src under NDD.

gcc/ChangeLog:

	* config/i386/i386-expand.cc (ix86_split_ashl_ndd): New
	function to split NDD form lshift.
	(ix86_split_rshift_ndd): Likewise for l/ashiftrt.
	* config/i386/i386-protos.h (ix86_split_ashl_ndd): New
	prototype.
	(ix86_split_rshift_ndd): Likewise.
	* config/i386/i386.md (ashl<mode>3_doubleword): Add NDD
	alternative, call ndd split function when operands[0]
	not equal to operands[1].
	(define_split for doubleword lshift): Likewise.
	(define_peephole for doubleword lshift): Likewise.
	(<insn><mode>3_doubleword): Likewise for l/ashiftrt.
	(define_split for doubleword l/ashiftrt): Likewise.
	(define_peephole for doubleword l/ashiftrt): Likewise.

gcc/testsuite/ChangeLog:

	* gcc.target/i386/apx-ndd-ti-shift.c: New test.