Reformat some code; Add support for generating PLWA with offsets whose bottom 2 bits...

Reformat some code; Add support for generating PLWA with offsets whose bottom 2 bits are non-zero.

2019-10-23  Michael Meissner  <meissner@linux.ibm.com>

	* config/rs6000/rs6000.md (mov<mode>_64bit_dm): Reformat.
	(movtd_64bit_nodm): Reformat.
	(mov<mode>_32bit): Reformat.
	(mov<mode>_softfloat): Reformat.
	(FMOVE128_GPR splitter): Reformat.
	(DIFD splitter): Reformat.
	(TI2 splitter): Reformat.
	* config/rs6000/predicates.md (lwa_operand): If the bottom two
	bits of the offset for the memory address are non-zero, use PLWA
	if prefixed instructions are available.

From-SVN: r277349