config.host: Match little-endian powerpc-linux.

libgcc/
	* config.host: Match little-endian powerpc-linux.
gcc/
	* config.gcc: Support little-endian powerpc-linux targets.
	* config/rs6000/linux.h (LINK_OS_LINUX_EMUL): Define.
	(LINK_OS_LINUX_SPEC): Define.
	* config/rs6000/linuxspe.h (TARGET_DEFAULT):
	Preserve MASK_LITTLE_ENDIAN.
	* config/rs6000/default64.h (TARGET_DEFAULT): Likewise.
	* config/rs6000/linuxaltivec.h (TARGET_DEFAULT): Likewise.
	* config/rs6000/linux64.h (OPTION_LITTLE_ENDIAN): Don't zero.
	(LINK_OS_LINUX_EMUL32, LINK_OS_LINUX_EMUL64): Define.
	(LINK_OS_LINUX_SPEC32, LINK_OS_LINUX_SPEC64): Use above.
	* config/rs6000/rs6000.c (output_toc): Don't use .tc for TARGET_ELF.
	Correct fp word order for little-endian.  Don't shift toc entries
	smaller than a word for little-endian.
	* config/rs6000/rs6000.md (bswaphi2, bswapsi2 split): Comment.
	(bswapdi2 splits): Correct low-part subreg for little-endian.
	Remove wrong BYTES_BIG_ENDIAN tests, and rename vars to remove
	low/high where such is correct only for be.
	* config/rs6000/sysv4.h (SUBTARGET_OVERRIDE_OPTIONS): Allow
	little-endian for -mcall-aixdesc.

From-SVN: r198273