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whether register x18 should be reserved. This change is needed because we cannot use a backend option to set cl::opt "aarch64-reserve-x18" when doing LTO. Out-of-tree projects currently using cl::opt option "-aarch64-reserve-x18" to reserve x18 should make changes to add subtarget feature "reserve-x18" to the IR. rdar://problem/21529937 Differential Revision: http://reviews.llvm.org/D11463 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@243186 91177308-0d34-0410-b5e6-96231b3b80d8
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