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4519123d - Introduce CONSTANT_VARIABLE_FALSE singleton for ConstantVariable(False) (#174759)

Introduce CONSTANT_VARIABLE_FALSE singleton for ConstantVariable(False) (#174759) Summary: Same approach as CONSTANT_VARIABLE_NONE and CONSTANT_VARIABLE_TRUE — VariableTrackers are immutable, so ConstantVariable(False) can be shared as a singleton. Authored with Claude. X-link: https://github.com/pytorch/pytorch/pull/174759 Approved by: https://github.com/mlazos ghstack dependencies: #174758 Reviewed By: atalman Differential Revision: D93867419 fbshipit-source-id: 8c830ac76a4c907c8c2c003600b6814944dad5f5