gccrs: Implement name resolution for IdentifierPattern's subpattern

gcc/rust/ChangeLog:

	* resolve/rust-ast-resolve-pattern.cc: Implement name resolution for
		IdentifierPattern's subpattern.
	* resolve/rust-late-name-resolver-2.0.cc: Ditto, but for nr2.

Signed-off-by: Yap Zhi Heng <yapzhhg@gmail.com>

Author: Polygonalr

gcc/rust/resolve/rust-ast-resolve-pattern.cc

@@ -62,6 +62,11 @@ PatternDeclaration::go (AST::Pattern &pattern, Rib::ItemType type,
 void
 PatternDeclaration::visit (AST::IdentifierPattern &pattern)
 {
+  if (pattern.has_subpattern ())
+    {
+      pattern.get_subpattern ().accept_vis (*this);
+    }
+
   Mutability mut = pattern.get_is_mut () ? Mutability::Mut : Mutability::Imm;
   add_new_binding (pattern.get_ident (), pattern.get_node_id (),
 		   BindingTypeInfo (mut, pattern.get_is_ref (),

gcc/rust/resolve/rust-late-name-resolver-2.0.cc

@@ -251,6 +251,11 @@ visit_identifier_as_pattern (NameResolutionContext &ctx,
 void
 Late::visit (AST::IdentifierPattern &identifier)
 {
+  if (identifier.has_subpattern ())
+    {
+      DefaultResolver::visit (identifier.get_subpattern ());
+    }
+
   visit_identifier_as_pattern (ctx, identifier.get_ident (),
 			       identifier.get_locus (),
 			       identifier.get_node_id ());