[lldb][test] Handle failure to get /proc/cpuinfo from a remote Linux platform (#108183) I've been testing against qemu-aarch64 using the qemu-user platform, which doesn't support get-file: ``` AssertionError: False is not true : Command 'platform get-file "/proc/cpuinfo" <...>/TestAArch64LinuxMTEMemoryRegion.test_mte_regions/cpuinfo Command output: get-file failed: unimplemented ' did not return successfully ``` QEMU itself does support overriding cpuinfo for the emulated process (https://gitlab.com/qemu-project/qemu/-/commit/a55b9e72267085957cadb0af0a8811cfbd7c61a9) however we'd need to be able to read the cpuinfo before the process starts, so I'm not attempting to use this feature. Instead if the get-file fails, assume empty cpuinfo so we can at least carry on testing. I've logged the failure and the reason to the trace so developers can find it. ``` runCmd: platform get-file "/proc/cpuinfo" <...>/TestAArch64LinuxMTEMemoryRegion.test_mte_regions/cpuinfo check of return status not required runCmd failed! Failed to get /proc/cpuinfo from remote: "get-file failed: unimplemented" All cpuinfo feature checks will fail. ``` For now this only helps AArch64 but I suspect that RISC-V, being even more mix and match when it comes to extensions, may need this in future. And I know we have some folks testing against qemu-riscv at the moment.
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