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Windows on ARM uses R11 for the frame pointer even though the environment is a pure Thumb-2, thumb-only environment. Replicate this behaviour to improve Windows ABI compatibility. This register is used for fast stack walking, and thus is part of the Windows ABI. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@209085 91177308-0d34-0410-b5e6-96231b3b80d8