[Target] Add target-independent TargetVerifier dispatcher Introduce a target-dependent IR verification framework that can be run from target-independent locations. TargetVerify is a base class each backend subclasses to check a function for constructs that are invalid for a particular target. Backends register a factory keyed by Triple::ArchType via registerTargetVerify(), typically from their LLVMInitialize<Target>Target(). TargetVerifierPass (registered as "target-verifier") is the dispatcher: it reads the module triple and, if a verifier is registered for that architecture, runs the generic IR verifier followed by the target's TargetVerify. It is a no-op for targets that have not registered a verifier, so it is safe to schedule from generic, target-independent pipelines (e.g. `opt -passes=target-verifier`). createTargetVerifierPass() is a legacy-PM wrapper that TargetPassConfig adds to the codegen pipeline under -verify-target, so the target verifier can also run from llc (e.g. `llc -verify-target`).
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