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Swift SVN r29280
rdar://20775683 Swift SVN r28309
rdar://17168115. Also, reinstate the ARM driver change and testcase that I removed in my last patch. Swift SVN r19790
We were emitting an extra retain and/or forgetting to release unowned references when semantically loading them, causing unowned references to almost always leak memory. Fixes <rdar://problem/16980445> and probably other bugs. Swift SVN r18904