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It is very likely that the swiftself parameter is alive throughout most functions function so putting it into a callee save register should avoid spills for the callers with only a minimum amount of extra spills in the callees. Currently the generated code is correct but unnecessarily spills and reloads arguments passed in callee save registers, I will address this in upcoming patches. This also adds a missing check that for tail calls the preserved value of the caller must be the same as the callees parameter. Differential Revision: http://reviews.llvm.org/D19007 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@266251 91177308-0d34-0410-b5e6-96231b3b80d8
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