[ASTImporter] Fix handling of overriden methods during ASTImport
Summary: When importing classes we may add a CXXMethodDecl more than once to a CXXRecordDecl when handling overrides. This patch will fix the cases we currently know about and handle the case where we are only dealing with declarations. Differential Revision: https://reviews.llvm.org/D56936 llvm-svn: 352436
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