Cleanup mixed precision and gather node layer info mapping#434

ynankani merged 3 commits intomainNVIDIA/TensorRT-Model-Optimizer:mainfrom

ynankani/refactor_mixed_precision_and_gather_nodes_quantizationNVIDIA/TensorRT-Model-Optimizer:ynankani/refactor_mixed_precision_and_gather_nodes_quantizationCopy head branch name to clipboard