re PR target/45807 (Lying eh_frame r2 save info causes crashes with static libgcc_eh...

re PR target/45807 (Lying eh_frame r2 save info causes crashes with static libgcc_eh and libstdc++)

	PR target/45807
	Backport r164685,r164825,r165101
	* config/rs6000/aix.h (SETUP_FRAME_ADDRESSES): Delete.
	* config/rs6000/linux64.h (SETUP_FRAME_ADDRESSES): Delete.
	* config/rs6000/rs6000-protos.h (rs6000_aix_emit_builtin_unwind_init):
	Delete.
	* config/rs6000/rs6000.c (rs6000_aix_emit_builtin_unwind_init): Delete.
	(rs6000_emit_prologue): Don't just create frame save info for r2,
	actually save r2.

From-SVN: r166857