[C++20] [Modules] Add Decl::isFromGlobalModule

Author: ChuanqiXu9

clang/include/clang/AST/DeclBase.h

@@ -680,6 +680,9 @@ class alignas(8) Decl {
   /// Whether this declaration comes from explicit global module.
   bool isFromExplicitGlobalModule() const;
 
+  /// Whether this declaration comes from global module.
+  bool isFromGlobalModule() const;
+
   /// Whether this declaration comes from a named module.
   bool isInNamedModule() const;
 

clang/lib/AST/DeclBase.cpp

@@ -1161,6 +1161,10 @@ bool Decl::isFromExplicitGlobalModule() const {
   return getOwningModule() && getOwningModule()->isExplicitGlobalModule();
 }
 
+bool Decl::isFromGlobalModule() const {
+  return getOwningModule() && getOwningModule()->isGlobalModule();
+}
+
 bool Decl::isInNamedModule() const {
   return getOwningModule() && getOwningModule()->isNamedModule();
 }