Move most CXXRecordDecl::DefinitionData bit-fields out into a separate
file.

Reduces duplication and thereby reduces the risk that someone will
forget to update one of these places, as I did when adding
DefaultedDestructorIsConstexpr (though I've been unable to produce
a testcase for which that matters so far).

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@374484 91177308-0d34-0410-b5e6-96231b3b80d8
6 files changed