This patch changes the archive handling to enable the semantics needed for legacy FORTRAN common blocks and block data. When we have a COMMON definition of a symbol and are including an archive, LLD will now search the members for global/weak defintions to override the COMMON symbol. The previous LLD behavior (where a member would only be included if it satisifed some other needed symbol definition) can be re-enabled with the option '-no-fortran-common'. Differential Revision: https://reviews.llvm.org/D86142
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