ubsan: Add -fsanitize=bool and -fsanitize=enum, which check for loads of

bit-patterns which are not valid values for enumerated or boolean types.
These checks are the ubsan analogue of !range metadata.


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@170108 91177308-0d34-0410-b5e6-96231b3b80d8