[wip] Enable ThinLTO with incremental compilation.#52309

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michaelwoerister wants to merge 8 commits intorust-lang:masterfrom

michaelwoerister:incr-thinlto-2

Commits on Jul 13, 2018

Change LLVMRustGetThinLTOModuleImports() so it also works with LLVM 4.
michaelwoerister
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Use ThinLTO import information when doing incremental compilation.
michaelwoerister
committed