codegen: make more judicious use of global rooting #56625
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Only temporarily root objects during codegen, so that it is the responsibility of the caller to ensure the values live (including write barriers and old generations) only as long as necessary for correct execution, and not preserve values that never make it into the IR.
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Only temporarily root objects during codegen, so that it is the responsibility of the caller to ensure the values live (including write barriers and old generations) only as long as necessary for correct execution, and not preserve values that never make it into the IR.