This patch set mainly aims at improving the S/390 disassembler's

This patch set mainly aims at improving the S/390 disassembler's
readability and also fixes some minor issues.

  S/390: Split disassembler routine into smaller functions
  S/390: Fix disassembler's treatment of signed/unsigned operands
  S/390: Fix off-by-one error in disassembler initialization
  S/390: Simplify opcode search loop in disassembler
  S/390: Drop function pointer dereferences in disassembler
  S/390: Various minor simplifications in disassembler