[PATCH] Added missing exports

[Sean Silva]

It turns out that `Module::buildVisibleModulesCache` just recursively calls `Module::getExportedModules`. So without the self-export, the submodule doesn't export anything and contributes no exports, but if it does export itself, then it contributes itself to the list of exports.

In this case, e.g. `#include <x86intrin.h>` will trigger `module intel` to be imported, and since that module imports `wmmintrin.h` (through `immintrin.h`), then the aforementioned situation triggers.


http://reviews.llvm.org/D9842

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