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This patch adds a Clang-compatible -mtune option to llc, to enable decoupled ISA and microarchitecture targeting, which is especially important for backend development. For example, it can enable to easily test a subtarget feature or scheduling model effects on codegen across a variaty of workloads on the IR corpus benchmark: https://github.com/dtcxzyw/llvm-codegen-benchmark. The implementation adds an isolated generic codegen flag, to establish a base for wider usage - the plan is to add it to `opt` as well in a followup patch. Then `llc` consumes it, and sets `tune-cpu` attributes for functions, which are further consumed by the backend.
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