[PATCH] [llvm-mc] Fix bad sign extension on callw immediate

[Douglas Katzman]

add test please, perhaps next to the 'callw' test in test/MC/Disassembler/X86/x86-16.txt


REPOSITORY
  rL LLVM

http://reviews.llvm.org/D9514

EMAIL PREFERENCES
  http://reviews.llvm.org/settings/panel/emailpreferences/