Cleanup dead assignments reported by scan-build

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@204569 91177308-0d34-0410-b5e6-96231b3b80d8
If a name is injected into an imported inline namespace without reopening that
namespace, we need to update both the visible names of that namespace and of
its enclosing namespace set.


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@204570 91177308-0d34-0410-b5e6-96231b3b80d8
Consistently dump default template arguments for template parameters as 'TemplateArgument's.


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@204572 91177308-0d34-0410-b5e6-96231b3b80d8