Fix implicit conversion of NULL constant to 'bool'.


git-svn-id: https://llvm.org/svn/llvm-project/lldb/trunk@220318 91177308-0d34-0410-b5e6-96231b3b80d8
Remove unused variable.


git-svn-id: https://llvm.org/svn/llvm-project/lldb/trunk@220319 91177308-0d34-0410-b5e6-96231b3b80d8
Move anonymous types declared in an anonymous union to
outside the anonymous union as it's a language extension
we don't normally support.


git-svn-id: https://llvm.org/svn/llvm-project/lldb/trunk@220320 91177308-0d34-0410-b5e6-96231b3b80d8