Import Microblaze fix into 2.26 branch

[Nick Clifton]

Hi Mike,

  I have taken the liberty of importing your recent patch to
  tc-microblaze.c into the 2.26 branch.  Without it I was unable to
  build a microblaze assembler on a 64-bit host.

Cheers
  Nick

gas/ChangeLog
2015-11-18  Nick Clifton  <nickc@redhat.com>

	Import from mainline:
	2015-11-16  Mike Frysinger  <vapier@gentoo.org>

	* config/tc-microblaze.c (parse_imm): Add an offsetT cast.