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199eb1d6e7
Removes a `copy_block` if its only uses, beside ownership instructions, are callees of function calls ``` %2 = copy_block %0 %3 = begin_borrow [lexical] %2 %4 = apply %3() : $@convention(block) @noescape () -> () end_borrow %3 destroy_value %2 ``` -> ``` %4 = apply %0() : $@convention(block) @noescape () -> () ``` rdar://118521396