Add has_default to GenericParamDefKind::Const

This currently creates a field which is always false on GenericParamDefKind for future use when
consts are permitted to have defaults

Update const_generics:default locations

Previously just ignored them, now actually do something about them.

Fix using type check instead of value

Add parsing

This adds all the necessary changes to lower const-generics defaults from parsing.

Change P<Expr> to AnonConst

This matches the arguments passed to instantiations of const generics, and makes it specific to
just anonymous constants.

Attempt to fix lowering bugs

compiler/rustc_resolve/src/late.rs

@@ -616,6 +616,7 @@ impl<'a: 'ast, 'ast> Visitor<'ast> for LateResolutionVisitor<'a, '_, 'ast> {
                     self.visit_ty(ty);
                     self.ribs[TypeNS].pop().unwrap();
                     self.ribs[ValueNS].pop().unwrap();
+                    // FIXME(const_generics:default) do something with default here?
                 }
             }
         }

compiler/rustc_resolve/src/late/lifetimes.rs

@@ -2004,7 +2004,9 @@ impl<'a, 'tcx> LifetimeContext<'a, 'tcx> {
                             GenericParamDefKind::Type { object_lifetime_default, .. } => {
                                 Some(object_lifetime_default)
                             }
-                            GenericParamDefKind::Lifetime | GenericParamDefKind::Const => None,
+                            GenericParamDefKind::Lifetime | GenericParamDefKind::Const { .. } => {
+                                None
+                            }
                         })
                         .collect()
                 })