"opt" is not being built with ASan, so the IR-level ARC optimizer tests
won't work.
DebugInfo/variables-repl.swift seems to be passing, possibly because we're
not using the SwiftASTStreamerPass when we generate debug info anymore.
stdlib/NewString.swift is still failing; we're not seeing the expected
capacity for a particular string.
Swift SVN r13833
This was not likely an error-free change. Where you see problems
please correct them. This went through a fairly tedious audit
before committing, but comments might have been changed incorrectly,
not changed at all, etc.
Swift SVN r7631
which defeated the optimization which formed "retainThree" tail calls. Restructure
and generalize this optimization to handle the new and old forms. Through
the combination of the two, we now form 19 of them on the stdlib. Before I broke
things, we only formed 14 of them.
Swift SVN r2124
