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Restructure Triple::getARMCPUForArch so that invalid values will return nullptr, while retaining the behaviour that an argument specifying no particular architecture version will give a default CPU. This will be used by clang to give an error on invalid -march values. Also restructure the extraction of the architecture version from the MArch string a little to hopefully make what it's doing clearer. Differential Revision: http://reviews.llvm.org/D9599 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@236845 91177308-0d34-0410-b5e6-96231b3b80d8
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