[pull] swift/main from apple:swift/main #1132
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1. We were allocating arg stack space twice for tail calls, once manually and once in the CallSeq instructions. 2. We sometimes moved sp right to its entry point and then subtracted it again to "reallocate" argument stack space. During that interval arguments are vulnerable to clobbering by a kernel interruption. 3. We weren't reserving space at incoming SP for the largest potential tail call this function makes, so we clobbered callee-saved registers (and anything else in the way) with arguments.
Cherry-picking latest swifttailcc changes
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