[mir-opt] Allow debuginfo to be generated for a constant or a Place

Prior to this commit, debuginfo was always generated by mapping a name
to a Place. This has the side-effect that `SimplifyLocals` cannot remove
locals that are only used for debuginfo because their other uses have
been const-propagated.

To allow these locals to be removed, we now allow debuginfo to point to
a constant value. The `ConstProp` pass detects when debuginfo points to
a local with a known constant value and replaces it with the value. This
allows the later `SimplifyLocals` pass to remove the local.

compiler/rustc_mir/src/transform/mod.rs

@@ -21,6 +21,7 @@ pub mod check_consts;
 pub mod check_packed_ref;
 pub mod check_unsafety;
 pub mod cleanup_post_borrowck;
+pub mod const_debuginfo;
 pub mod const_prop;
 pub mod coverage;
 pub mod deaggregator;
@@ -408,6 +409,7 @@ fn run_optimization_passes<'tcx>(tcx: TyCtxt<'tcx>, body: &mut Body<'tcx>) {
         &remove_noop_landing_pads::RemoveNoopLandingPads,
         &simplify::SimplifyCfg::new("final"),
         &nrvo::RenameReturnPlace,
+        &const_debuginfo::ConstDebugInfo,
         &simplify::SimplifyLocals,
         &multiple_return_terminators::MultipleReturnTerminators,
     ];