* config/tc-arc.c (tc_gen_reloc): Translate BFD_RELOC_32_PCREL
        to BFD_RELOC_ARC_PC32.

While the assembler will handle BFD_RELOC_32_PCREL if the
bfd/elf32-arc.c "if 0" sections in elf_arc_howto_table
and arc_reloc_map are enabled, the linker would eventually crash
when linking libgcc_s.so.1.tmp .