[swift-3.0] Added -tools-directory option. (#2912) #4543
Merged
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Add -tools-directory to swift 3.0, to support cross-compiling. It's not the end of the story for cross-compiling with Swift, but it's what we've got for now.
Cherry-picked 20d9b96
Provides a path to look for ld (Darwin), or clang/binutils (Unix).