[PATCH] [lld][Core] Implement parallel_for_each

[Shankar Kalpathi Easwaran]

I tried to self host lld and self host clang and the time taken to link one in 10 runs, saves the link time by 1/2 a second. I changed the minParallelSize to be 512 for the function parallel_for_each to make this happen though.


http://reviews.llvm.org/D8348

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