Rollup merge of #117441 - cjgillot:diag-noassert, r=oli-obk,RalfJung

Do not assert in op_to_const.

`op_to_const` is used in `try_destructure_mir_constant_for_diagnostics`, which may encounter invalid constants created by optimizations and debugging.

r? ``@oli-obk``

Fixes rust-lang/rust#117368

Author: matthiaskrgr

clippy_utils/src/consts.rs

@@ -710,7 +710,7 @@ fn field_of_struct<'tcx>(
     field: &Ident,
 ) -> Option<mir::Const<'tcx>> {
     if let mir::Const::Val(result, ty) = result
-        && let Some(dc) = lcx.tcx.try_destructure_mir_constant_for_diagnostics(result, ty)
+        && let Some(dc) = lcx.tcx.try_destructure_mir_constant_for_user_output(result, ty)
         && let Some(dc_variant) = dc.variant
         && let Some(variant) = adt_def.variants().get(dc_variant)
         && let Some(field_idx) = variant.fields.iter().position(|el| el.name == field.name)