Disable layout-transitivity test on Darwin for now.

git-svn-id: https://llvm.org/svn/llvm-project/lld/trunk@193121 91177308-0d34-0410-b5e6-96231b3b80d8
Initialize some members where they are declared. No functionality change.

git-svn-id: https://llvm.org/svn/llvm-project/lld/trunk@193122 91177308-0d34-0410-b5e6-96231b3b80d8
Revert "Initialize some members where they are declared."

Because MSVC11 doesn't like this new C++11 feature. The last commit
broke the buildbot.

git-svn-id: https://llvm.org/svn/llvm-project/lld/trunk@193127 91177308-0d34-0410-b5e6-96231b3b80d8