[AVR] Compile the disassembler

This also updates references of 'TheAVRTarget' to the new
'getTheAVRTarget()' method.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@285272 91177308-0d34-0410-b5e6-96231b3b80d8
3 files changed