Fix bug and speed up Grappler constant folding
Fix bug in and speed up ConstantFolding::CreateNodeDef(): * Fix bug trying to store more than kintmax32 values in a repeated proto field. * Speed up populating compressed format. Example: tensorflow/python/kernel_tests/large_concat_op_test with size = 2**29+6 goes from ~30 seconds to ~15 seconds. The fraction of time spent in ConstantFolding::CreateNodeDef() goes down from about 35% to about 12%.
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