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When a register like R1 is reserved, X1 should be reserved as well. This was already done "manually" when 64bit code was enabled, however using the markSuperRegs() function on the base register is more convenient and allows to use the checksAllSuperRegsMarked() function even in 32bit mode to avoid accidental breakage in the future. This is also necessary to allow https://reviews.llvm.org/D28881 Differential Revision: https://reviews.llvm.org/D29056 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@292870 91177308-0d34-0410-b5e6-96231b3b80d8
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