Make sure methods with no return type default to "id".
This fixes a crasher in Sema::MatchTwoMethodDeclarations(), identified by selector-overload.m (just added).
Added Action::ActOnTranslationUnitScope() and renamed Action::PopScope to ActOnPopScope.
Added a Translation Unit Scope instance variable to Sema (will be very useful to ObjC-related actions, since ObjC declarations are always file-scoped).
git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@42817
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