Rollup merge of #159029 - erickt:lto-module-summaries, r=cuviper rustc_llvm: Emit module summaries when using -Clto=fat Currently, module summaries are only emitted with thin lto. If we would link full/fat lto'd rust code against lto'd c++ code built with CFI (or WPD), those passes would fail during the link step because the participating rust modules are missing module summaries. Rust code does not know at compile-time if it would be participating in some special link which may require module summaries, so this PR ensures module summaries are unconditionally emitted for full/fat lto, just like with thin lto. The WriteBitcodeToFile function just invokes the normal BitcodeWriterPass under the hood, but doesn't provide a way to set the argument for emitting module summaries. So this patch just adds the pass directly and sets that argument. This is a rebase of @PiJoules's https://github.com/rust-lang/rust/pull/158099, which also should fix up the tests with the gcc tools.
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