[PATCH] ​R​ISC-V: Add new option -mrelax/-mno-relax.

[Kito Cheng]

This patch add -mrelax and -mno-relax option to RISC-V assembler to
enable/disable relax optimization for input file.

2018-04-20  Kito Cheng  <kito.cheng@gmail.com>

       * config/tc-riscv.c (options): Add OPTION_RELAX and
       OPTION_NO_RELAX.
       (md_longopts): New option -mrelax and -mno-relax.
       (md_parse_option): Handle -mrelax and -mno-relax.
       * doc/c-riscv.texi: Document for -mrelax and -mno-relax.
       * testsuite/gas/riscv/no-relax-reloc.d: New.
       * testsuite/gas/riscv/no-relax-reloc.s: New.
       * testsuite/gas/riscv/relax-reloc.d: New.
       * testsuite/gas/riscv/relax-reloc.s: New.
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