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The order of registers returned by getCalleeSavedRegs is used to lay out the fixed stack slots for CSRs. Some targets like their CSRs used from one end, and some targets want them used from the other end. When computing an allocation order, simply preserve the relative ordering of CSRs that the target specifies in its allocation order. Reordering CSRs would break some targets, ARM in particular. We still place volatiles before the CSRs, providing slightly better results with different calling conventions. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@132680 91177308-0d34-0410-b5e6-96231b3b80d8
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