Introduce RedeclarableTemplateDecl::SpecEntryTraits

SpecEntryTraits describes how to obtain the most recent declaration
of a specialisation from an entry in a specialisation FoldingSet.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@109868 91177308-0d34-0410-b5e6-96231b3b80d8
1 file changed