Fix MSB shift in prelink adjusting debug info

[Jakub Jelinek]

On Thu, Aug 06, 2009 at 11:52:34PM +0000, Joseph S. Myers wrote:
> This patch fixes an incorrect shift by 58 instead of 56 when computing the 
> most significant byte when prelink adjusts debug info.  Please commit if 
> OK.

Committed, thanks.

	Jakub