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Use function attribute "stackrealign" to decide whether stack
realignment should be forced. With this commit, we can now force stack realignment when doing LTO and do so on a per-function basis. Also, add a new cl::opt option "stackrealign" to CommandFlags.h which is used to force stack realignment via llc's command line. Out-of-tree projects currently using -force-align-stack to force stack realignment should make changes to attach the attribute to the functions in the IR. Differential Revision: http://reviews.llvm.org/D11814 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@247450 91177308-0d34-0410-b5e6-96231b3b80d8
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