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Rollup merge of #129170 - artemagvanian:span-to-location, r=celinval

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Add an ability to convert between `Span` and `visit::Location`

AFAIK, there is no way to create a `Location` from a `Span` because its only field is private. This makes it impossible to use visitor methods like `visit_statement` or `visit_terminator`.

This PR adds an implementation for`From<Span>` for `Location` to fix this.

r? ```@celinval```
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16
compiler/stable_mir/src/mir/visit.rs
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@ -465,6 +465,22 @@ impl Location {
}
}
/// Location of the statement at the given index for a given basic block. Assumes that `stmt_idx`
/// and `bb_idx` are valid for a given body.
pub fn statement_location(body: &Body, bb_idx: &BasicBlockIdx, stmt_idx: usize) -> Location {
let bb = &body.blocks[*bb_idx];
let stmt = &bb.statements[stmt_idx];
Location(stmt.span)
}
/// Location of the terminator for a given basic block. Assumes that `bb_idx` is valid for a given
/// body.
pub fn terminator_location(body: &Body, bb_idx: &BasicBlockIdx) -> Location {
let bb = &body.blocks[*bb_idx];
let terminator = &bb.terminator;
Location(terminator.span)
}
/// Reference to a place used to represent a partial projection.
pub struct PlaceRef<'a> {
pub local: Local,