PR bootstrap/37739
	* config.host: For powerpc*-*-linux* host with 32-bit GCC,
	use rs6000/x-linux-relax snippet if ld is new enough,
	otherwise use rs6000/x-linux-O1.
	* config/rs6000/x-linux-relax: New file.
	* config/x-cflags-O1: New file.

From-SVN: r142833