How to construct hir::ConstBlock in ast lowering

compiler
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I'm trying to improve the way format_args! gets lowered in the compiler, and I want to wrap the call to Arguments::new_const in a const block expr to make sure it gets constant folded (relavant github issue), but hir::ConstBlock doesn't have an obvious method of construction.

I have a hir::ExprKind, and I somehow need to turn that into a BodyId? some of the LoweringContext methods are useful for constructing other types of expressions, but not so much for ConstBlock.

Any idea how to do this?

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