Skip Object.keys allocation in FunctionHelperManager.getValue - #21601
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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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Checking for named arguments with
for...inavoids allocating a keys array on every plain-function helper invocation. Helpers without named args are the common case.