Implement getHostCPUName for ARM/linux. This will be used to implement -march=native in clang.
Implement getHostCPUName for ARM/linux. This will be used to implement -march=native in clang.

The cpuid registers are only available in privileged mode so we don't have
an OS-independent way of implementing this. ARM doesn't provide a list of
processor IDs so the list is somewhat incomplete.

git-svn-id: 0ff597fd157e6f4fc38580e8d64ab130330d2411@159228 91177308-0d34-0410-b5e6-96231b3b80d8

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