bd4837665b
This reverts commit r181947 (git d2990ce56a16050cac0d7937ec9919ff54c6df62 ) This addresses one of the two issues identified in r181947, ensuring that types imported via using declarations only result in a declaration being emitted for the type, not a definition. The second issue (emitting using declarations that are unused) is hopefully an acceptable increase as the real fix for this would be a bit difficult (probably at best we could record which using directives were involved in lookups - but may not have been the result of the lookup). This also ensures that DW_TAG_imported_declarations (& directives) are not emitted in line-tables-only mode as well as ensuring that typedefs only require/emit declarations (rather than definitions) for referenced types. llvm-svn: 182231