PR target/63150
gcc/
	* config/rs6000/rs6000.md (bswapdi2): Remove one scratch reg.
	Modify Z->r bswapdi splitter to use dest in place of scratch.
	In r->Z and Z->r bswapdi splitter rename word_high, word_low
	to word1, word2 and rearrange logic to suit.
	(bswapdi2_64bit): Remove early clobber on Z->r alternative.
	(bswapdi2_ldbrx): Likewise.  Remove '??' on r->r.
	(bswapdi2_32bit): Remove early clobber on Z->r alternative.
	Add one '?' on r->r.  Modify Z->r splitter to avoid need for
	early clobber.
gcc/testsuite/
	* gcc.target/powerpc/pr53199.c: Add extra functions.  Revert
	2014-12-05 change.

From-SVN: r221445