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r9 is defined as a platform-specific register in the ARM EABI. It can be reserved for a special purpose or be used as a general purpose register. Add support for reserving r9 for all ARM, while leaving the IOS usage unchanged. Patch by Jeroen Hofstee. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@188485 91177308-0d34-0410-b5e6-96231b3b80d8