buildbot: Remove C++11 config options and builder

Building with C++11 has been the default for some time now, and the
--enable-cxx11 flag doesn't even exist anymore. This removes the
support for it and the redundant builder that was using this.

git-svn-id: https://llvm.org/svn/llvm-project/zorg/trunk@209931 91177308-0d34-0410-b5e6-96231b3b80d8
llvmlab: Whitespace cleanup

git-svn-id: https://llvm.org/svn/llvm-project/zorg/trunk@209932 91177308-0d34-0410-b5e6-96231b3b80d8
llvmlab: Remove commented out builders

We can resurrect these from version control when we need them.

git-svn-id: https://llvm.org/svn/llvm-project/zorg/trunk@209933 91177308-0d34-0410-b5e6-96231b3b80d8
llvmlab: Move the LTO build to phase 4 and libc++ tests to phase 3

The LTO build takes a very long time and is holding up phase 3
significantly, whereas the libc++ tests are very fast and aren't
running nearly often enough. This shuffles things around to try to
improve these problems a bit.

git-svn-id: https://llvm.org/svn/llvm-project/zorg/trunk@209934 91177308-0d34-0410-b5e6-96231b3b80d8