* tc-alpha.c (in_range_signed, in_range_unsigned): New routines, split from

* tc-alpha.c (in_range_signed, in_range_unsigned): New routines, split from
in_range.
(in_range): Deleted.  All calls changed to in_range_*signed.
(create_lita_section): Macro deleted.  Single use expanded in place.
(alpha_ip): Handle `t' and `8' operand types.
(md_apply_fix): Handle BFD_RELOC_12_PCREL.  Print name of unhandled relocation
types.
* alpha-opcode.h: Added HALT and DRAINA.  Disabled MOVI, since it doesn't work,
and isn't supported by the native assembler.