Reland: "[Exegesis] Add the ability to dry-run the measurement phase (#121991)" (#122775) This relands f8f8598fd886cddfd374fa43eb6d7d37d301b576 Follow up on #122371: The problem here is a little subtle: when we dry-run the measurement phase, we create a LLJIT instance without actually executing the snippets. The key is, LLJIT has its own TargetMachine which uses triple designated by LLVM_TARGET_ARCH (which is default to host). On a machine that does not support Exegesis, the LLJIT would fail to create its TargetMachine because llvm-exegesis don't even register the host's target! Putting this test into any of the target-specific folder won't help, because it's about the host. And personally I don't really want to use `exegesis-can-execute-<arch>` for generic tests like this -- it's too strict as we don't actually need to execute the snippet. My solution here is creating another test feature which is added only when LLVM_TARGET_ARCH is supported by llvm-exegesis. This feature is something in between `<arch>-registered-target` and `exegesis-can-execute-<arch>`.
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