i386: Add more forms peephole2 for adc/sbb

i386: Add more forms peephole2 for adc/sbb

Enable -mapxf will change some patterns about adc/sbb.

Hence gcc will raise an extra mov like
         movq    8(%rdi), %rax
         adcq    %rax, 8(%rsi), %rax
         movq    %rax, 8(%rdi)
rather than
         movq    8(%rsi), %rax
         adcq    %rax, 8(%rdi)

The patch add more kinds of peephole2 to eliminate the extra mov.

gcc/ChangeLog:

	* config/i386/i386.md: Add 4 new peephole2 by swap the original
	peephole2's operands' order to support new pattern.

gcc/testsuite/ChangeLog:

	* gcc.target/i386/pr79173-13.c: New test.
	* gcc.target/i386/pr79173-14.c: Ditto.
	* gcc.target/i386/pr79173-15.c: Ditto.
	* gcc.target/i386/pr79173-16.c: Ditto.
	* gcc.target/i386/pr79173-17.c: Ditto.
	* gcc.target/i386/pr79173-18.c: Ditto.