[5.8] Enable '-clang-target' by-default #1251
Merged
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Cherry-pick of #1250
This will result in the driver passing down '-clang-target' flag to the frontend, which will then ensure that all downstream module (Swift and Clang) compilation compiler sub-invocations are consistent with respect to the target triple used by their underlying instances of Clang. Resulting in all Clang module dependencies being built against the main module's target triple.