low order sign bit propogationfor R_V850_HI16_S. Fixes c-torture execute/950221-1.c, maybe others.
(elf_v850_howto_table): Add support for R_V850_{32,16,8}. (v850_reloc_map): Add translation from BFD_RELOC_{32,16,8} to R_V850_{32,16,8}. So we don't get "reloc XXX not supported" messages anymore.
(elf_v850_howto_table): Add info for HI16_S reloc. (v850_reloc_map): Add HI_16_S reloc. * reloc.c: Define BFD_RELOC_V850_* relocs.