tejohnson added inline comments.

================
Comment at: lib/CodeGen/CodeGenAction.cpp:822
@@ +821,3 @@
+      TheModule = std::move(Combined);
+    }
+
----------------
joker.eph wrote:
> tejohnson wrote:
> > joker.eph wrote:
> > > Could we refactor this in a helper in llvm?
> > I can create a new Linker interface that takes the index path, builds the 
> > index, does the link and returns the ErrorOr index.
> I was thinking about a free function that would be something like: 
> `std::unique_ptr<Module> llvm::renameModuleForThinLTO(std::unique_ptr<Module> 
> &M, const FunctionInfoIndex &Index);`
> 
We also need to get the Index back so that it can be passed down to 
EmitBackendOutput below (to get it on the pass manager builder). So what I was 
thinking was create the Combined Module unique_ptr here and pass it in (as we 
do currently for LinkModules), and return the 
std::unique_ptr<FunctionInfoIndex> .


http://reviews.llvm.org/D15025



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