Fix bls for Thumb2

Fix bls for Thumb2

2009-12-24  Ramana Radhakrishnan  <ramana.radhakrishnan@arm.com>

        Backport from trunk:
	2009-12-21  Ramana Radhakrishnan  <ramana.radhakrishnan@arm.com>
	            Richard Earnshaw  <richard.earnshaw@arm.com>

        * config/tc-arm.c (encode_thumb2_b_bl_offset): New. Refactored
        from md_apply_fix.
        (md_apply_fix): Fixup range checks for Thumb2 version
        of unconditional calls. Call encode_thumb2_b_bl_offset for
        unconditional branches / function calls.