Contracts who have loops with undefined number of iterations cause wrong price estimates

There are certain methods where it is hard to estimate gas. Example: exchange at [Curve](https://compound.curve.fi/), [recording](https://twitter.com/CurveFinance/status/1221433123507986433). The estimated gas amount is over 9 million while typical is 650k.

It it possible to let Metamask follow the gas estimates recorded in the ABI rather than re-estimating?

The issue names no files or tests. Start by tracing MetaMask’s transaction gas-estimation flow and how ABI gas values are handled, then reproduce the Curve exchange case. Done means the relevant ABI estimate can be used without an inflated re-estimation for contracts with loops of undefined length.

Written by the indexing model from the issue text.