Since 4c4a180d lto has turned off flag_pic when linking a fixed
position executable. So flag_pic is zero in rs6000_file_start.
However, when we get to actually emitting code, flag_pic may be on
again. This results in undefined references to ".LCTOC1".
PR target/68662
* config/rs6000/rs6000.c (need_toc_init): New var, set it
whenever toc_label_name used.
(rs6000_file_start): Don't set up toc section here,
(rs6000_output_function_epilogue): do so here instead,
(rs6000_xcoff_file_start): and here.
* config/rs6000/rs6000.md (load_toc_aix_si): Set need_toc_init.
(load_toc_aix_di): Likewise.
From-SVN: r233061
