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79cbad188a
`sandboxir::Context` is defined at a pass-level scope with the `SandboxVectorizerPass` class because the function pass manager `FPM` object depends on it, and that is in pass-level scope to avoid recreating the pass pipeline every single time `runOnFunction()` is called. This means that the Context's state lives on across function passes. The problem is twofold: (i) the LLVM IR to Sandbox IR map can grow very large including objects from different functions, which is of no use to the vectorizer, as it's a function-level pass. (ii) this can result in stale data in the LLVM IR to Sandbox IR object map, as other passes may delete LLVM IR objects. To fix both issues this patch introduces a `Context::clear()` function that clears the `LLVMValueToValueMap`.