testsuite: support set sysroot.
rs6000: epilogue unwinder.
Process record support for PowerPC.
rs6000-record: Add more opcode.
rs6000-record: op31
rs6000-record: Complete op31.
rs6000-record: Complete op19.
rs6000-record: Add DFP instructions.
rs6000-record: Complete op59 and op63.
rs6000-record: op4.
rs6000-record: Implement process_record_signal.

   * Implement process_record_signal.
   * Add comments for ioctl/syscall numbers.
rs6000-record: Complete Chapter 5. Vector Facility [Category: Vector]
rs6000-record: Add op61 and revise op62.
rs6000-record: Add missing op31 instructions.
rs6000-record: Change some 'break' to 'return 0'.
rs6000-record: Fix recording registers clobbered during syscall.
rs6000-record: Fix instruction comments.
rs6000-record: fix bug of dcsz.
rs6000-record: fix bug in ppc_linux_syscall_record.
rs6000-record: minor fixes