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[AArch64] Add native CPU detection for Microsoft Azure Cobalt 100. (#…
…77793) This patch extends the -mcpu/mtune=native support to handle the Microsoft Azure Cobalt 100 CPU as a Neoverse N2. We expect users to use -mcpu=neoverse-n2 when targeting this CPU and all the architecture and codegen decisions to be identical. The only difference is that the Microsoft Azure Cobalt 100 has a different Implementer ID in the /proc/cpuinfo entry that needs to be detected in getHostCPUNameForARM appropriately.
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