Suppress "using extended field designator is an extension" warning in use of offsetof.

git-svn-id: https://llvm.org/svn/llvm-project/lldb/trunk@192578 91177308-0d34-0410-b5e6-96231b3b80d8
Test commit

git-svn-id: https://llvm.org/svn/llvm-project/lldb/trunk@192579 91177308-0d34-0410-b5e6-96231b3b80d8
Remove added file for the test commit

git-svn-id: https://llvm.org/svn/llvm-project/lldb/trunk@192580 91177308-0d34-0410-b5e6-96231b3b80d8