[LLD][COFF] Deduplicate common chunks when linking COFF files. (#162553) This fixes [issue 162148](https://github.com/llvm/llvm-project/issues/162148). Common symbols are intended to have only a single version of the data present in the final executable. The MSVC linker is able to successfully deduplicate these chunks. If you have an application with a large number of translation units with a large block of common data (this is possible, for example, with Fortran code), then failing to deduplicate these chunks can make the data size so large that the resulting executable fails to load. The logic in this patch doesn't catch all of the potential cases for deduplication, but it should catch the most common ones.
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