Fix free-before-use case in x86 finalize code. Bytecode transformation

Fix free-before-use case in x86 finalize code.  Bytecode transformation
deletes the old bytecode, so it's not safe to use anything from the old
bytecode after this point (such as the prefixes array passed to arch
finalize).

 * x86bc.c (yasm_x86__bc_apply_prefixes): Take x86_common as parameter
rather than bytecode; add line parameter instead of referencing bc->line.
 * x86arch.h (yasm_x86__bc_apply_prefixes): Likewise.
 * x86id.re (x86_finalize_jmpfar, x86_finalize_jmp)
(yasm_x86__finalize_insn): Apply prefixes before bytecode transform.

svn path=/trunk/yasm/; revision=1186