Hack Sema::MergeTypeDefDecl() to silently ignore duplicate typedef's in system headers files.

A bizarre, non-standard hook that many compilers appear to implement (sigh:-).



git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@46583 91177308-0d34-0410-b5e6-96231b3b80d8
1 file changed