use precalculated dominators in explain_borrow #1
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This looks like the only place calculating dominators from the MIR body every time instead of using the ones stored on the `MirBorrowckCtxt`. For example, in rust-lang#65131 a big generated function with a number of borrowck errors takes a few hours(!) recalculating the dominators while explaining the errors. I don't know enough about this part of rustc codebase to know for sure that this change is correct, but no tests seem to fail as a result of this change in local testing.
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This looks like the only place calculating dominators from the MIR body every time instead of using the ones stored on the
MirBorrowckCtxt. For example, in rust-lang#65131 a big generated function with a number of borrowck errors takes a few hours(!) recalculating the dominators while explaining the errors.I don't know enough about this part of rustc codebase to know for sure that this change is correct, but no tests seem to fail as a result of this change in local testing.