Refactor some the x86 bytecode handling now that we parse the entire file

Refactor some the x86 bytecode handling now that we parse the entire file
before finalizing instructions.

* x86arch.h (yasm_x86__bc_apply_prefixes): Don't take num_segregs and
prefixes parameters.
* x86bc.c (yasm_x86__bc_apply_prefixes): Move segreg code to...
* x86id.re (yasm_x86__finalize_insn): Here (only user of this code).
(x86_finalize_jmp): Don't pass num_segregs and prefixes.

* x86arch.h (x86_common): New; refactored common bytecode parameters.
(x86_opcode): New; refactored opcode parameters.
(x86_insn): Refactor with x86_common and x86_opcode.
(x86_jmp): Likewise.
* x86id.re (x86_finalize_common, x86_finalize_opcode): New.
(yasm_x86__finalize_insn, x86_finalize_jmp): Use and update substruct refs.
* x86bc.c (x86_common_print, x86_opcode_print): New.
(x86_bc_insn_print, x86_bc_jmp_print): Use and update substruct refs.
(x86_common_resolve): New.
(x86_bc_insn_resolve, x86_bc_jmp_resolve): Use and update substruct refs.
(x86_common_tobytes, x86_opcode_tobytes): New.
(x86_bc_insn_tobytes, x86_bc_jmp_tobytes): Use and update substruct refs.
(yasm_x86__bc_apply_prefixes): Utilize refactor to simplify.

* bytecode.c (bc_insn_finalize): Simplify (or at least level) immediates
and memory operands before passing them off to yasm_arch_finalize_insn().
This may result in some minor performance improvement on complex static
expressions.

* x86arch.h (x86_parse_targetmod): Add X86_FAR_SEGOFF; this is only
generated due to a SEG:OFF immediate being detected during finalize.
(x86_jmp_opcode_sel): Remove JMP_FAR; this is now a separate bytecode.
(x86_jmp): Remove far opcode.
(x86_jmpfar): New bytecode for far jumps.
(yasm_x86__bc_transform_jmpfar): New.
* x86bc.c (x86_bc_callback_jmpfar): New.
(yasm_x86__bc_transform_jmpfar, x86_bc_jmpfar_destroy): New.
(x86_bc_jmp_print): Move far jump code to..
(x86_bc_jmpfar_print): Here (new).
(x86_bc_jmp_resolve, x86_bc_jmpfar_resolve): Likewise (latter new).
(x86_bc_jmp_tobytes, x86_bc_jmpfar_tobytes): Likewise (latter new).
* x86id.re (OPAP_JmpFar): Remove (detected immediately now).
(jmp_insn, call_insn): Update.
(x86_finalize_jmpfar): New.
(x86_finalize_jmp): Remove far jump-related code.
(yasm_x86__finalize_insn): Add check for SEG:OFF immediate operand, and
apply X86_FAR_SEGOFF if necessary.  Match OPTM_Far against both X86_FAR
and X86_FAR_SEGOFF.  Add shortcut to x86_finalize_jmpfar().

svn path=/trunk/yasm/; revision=1182