[gjs: 3/4] arg-cache: Mark few more constructors as constexpr

[Philip Chimento <pchimento src gnome org>]

commit 6d83c2fdd2391bc9dbd3cbb5421e7810b575711b
Author: Marco Trevisan (Treviño) <mail 3v1n0 net>
Date:   Thu Jun 2 04:16:03 2022 +0200

    arg-cache: Mark few more constructors as constexpr

 gi/arg-cache.cpp | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)
---
diff --git a/gi/arg-cache.cpp b/gi/arg-cache.cpp
index bcf97b289..d5125fd73 100644
--- a/gi/arg-cache.cpp
+++ b/gi/arg-cache.cpp
@@ -229,9 +229,10 @@ struct Array : BasicType {
 };
 
 struct BaseInfo {
-    explicit BaseInfo(GIBaseInfo* info, const GjsAutoTakeOwnership& add_ref)
+    constexpr explicit BaseInfo(GIBaseInfo* info,
+                                const GjsAutoTakeOwnership& add_ref)
         : m_info(info, add_ref) {}
-    explicit BaseInfo(GIBaseInfo* info) : m_info(info) {}
+    constexpr explicit BaseInfo(GIBaseInfo* info) : m_info(info) {}
 
     GjsAutoBaseInfo m_info;
 };
@@ -264,7 +265,7 @@ struct RegisteredInterface : BaseInfo {
 };
 
 struct Callback : Nullable, BaseInfo {
-    explicit Callback(GIInterfaceInfo* info)
+    constexpr explicit Callback(GIInterfaceInfo* info)
         : BaseInfo(info, GjsAutoTakeOwnership{}),
           m_scope(GI_SCOPE_TYPE_INVALID) {}