Tweak the previous patch adding support for loading bitfields of arbitrary
scalar type so it does the right thing in funky cases that probably don't
exist, such as a bitfield containing an i31.


git-svn-id: https://llvm.org/svn/llvm-project/dragonegg/trunk@181898 91177308-0d34-0410-b5e6-96231b3b80d8