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`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`.
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