[ARC] Fix handling of ARCv2 H-register class.

For ARCv2, h-regs are only valid unitl r31.

gas/
2017-11-21  Claudiu Zissulescu <claziss@synopsys.com>

        * testsuite/gas/arc/hregs-err.s: New test.

opcodes/
2017-11-21  Claudiu Zissulescu <claziss@synopsys.com>

        * arc-opc.c (insert_rhv2): Check h-regs range.
4 files changed