LowLevelRegisters tuple order and drop unused register helpers - #21605
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Split out of nvp/simplify-some-vm-hot-paths. Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>
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The tuple type listed
$spbefore$fp, but the register constants are$fp=2, $sp=3, so theinitializeRegisters*helpers wrote to the wrong slots and their only caller immediately overwrote them.EvaluationStackImpl.restorenow builds the registers directly, and the duplicatesnapshotstatic block is removed since the constructor already installs it underLOCAL_DEBUG.