Fix a regression in the two-phase lookup diagnostics that switching the
namespace set algorithm (re-)introduced. We may not have seen the 'std'
namespace, but we should still suggested associated namespaces. Easy
fix, but a bit annoying to test.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@132744 91177308-0d34-0410-b5e6-96231b3b80d8
2 files changed