rs6000.c (rs6000_set_up_by_prologue): Make sure the TOC reg (r2) isn't in the set of registers defined in the prologue.

	* config/rs6000/rs6000.c (rs6000_set_up_by_prologue): Make sure the TOC
	reg (r2) isn't in the set of registers defined in the prologue.

	* gcc.target/powerpc/r2_shrink-wrap.c: New.

From-SVN: r252768