gccrs: Fix test same_field_name.rs

gcc/rust/ChangeLog:

	* hir/rust-ast-lower-item.cc
	(ASTLoweringItem::visit): Keep going after a duplicate field is
	found.

gcc/testsuite/ChangeLog:

	* rust/execute/same_field_name.rs: Move to...
	* rust/compile/same_field_name.rs: ...here and adjust expected
	errors.

Signed-off-by: Owen Avery <powerboat9.gamer@gmail.com>

gcc/rust/hir/rust-ast-lower-item.cc

@@ -217,7 +217,7 @@ ASTLoweringItem::visit (AST::StructStruct &struct_decl)
 					 field.get_outer_attrs ());
 
       if (struct_field_name_exists (fields, translated_field))
-	break;
+	continue;
 
       fields.push_back (std::move (translated_field));
     }

gcc/testsuite/rust/compile/same_field_name.rs

@@ -1,7 +1,7 @@
 // https://doc.rust-lang.org/error_codes/E0124.html
 fn main() {
     struct Foo {
-        field1: i32, // { dg-error "field .field1. is already declared" }
+        field1: i32,
         field1: i32, // { dg-error "field .field1. is already declared" }
         field1: i32, // { dg-error "field .field1. is already declared" }
     }