[PATCH] Offer typo suggestions for 'using'.

[Luke Zarko]

I found a case where Clang doesn't yet help with typo correction:

tests/base_using.cc:

namespace Q { class AAA {}; }
using Q::AAB;

Before:

tests/base_using.cc:2:10: error: no member named 'AAB' in namespace 'Q'
using Q::AAB;
      ~~~^

After:

tests/base_using.cc:2:10: error: no member named 'AAB' in namespace
'Q'; did you mean 'AAA'?
using Q::AAB;
      ~~~^
tests/base_using.cc:1:21: note: 'AAA' declared here
namespace Q { class AAA {}; }
                    ^

  Luke
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