Fix a warning about ‘r_type’ may be used uninitialized.

Thanks to Aaron Ballman for noticing this!


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@221696 91177308-0d34-0410-b5e6-96231b3b80d8
Use a 8 bit immediate when possible.

This fixes pr21529.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@221700 91177308-0d34-0410-b5e6-96231b3b80d8