CGDebugInfo: Use DIImportedEntity default constructor, NFC

Use the newly minted `DIImportedEntity` default constructor (r230609)
rather than explicitly specifying `nullptr`.  The latter will become
ambiguous when the new debug info hierarchy is committed, since we'll
have both of the following:

    explicit DIImportedEntity(const MDNode *);
    DIImportedEntity(const MDImportedEntity *);

(Currently we just have the former.)

A default constructor is just as clear.

llvm-svn: 230610

diff --git a/clang/lib/CodeGen/CGDebugInfo.cpp b/clang/lib/CodeGen/CGDebugInfo.cpp
index 19da145..6d78ee8 100644 (file)
--- a/clang/lib/CodeGen/CGDebugInfo.cpp
+++ b/clang/lib/CodeGen/CGDebugInfo.cpp
@@ -3321,11 +3321,11 @@ void CGDebugInfo::EmitUsingDecl(const UsingDecl &UD) {
 llvm::DIImportedEntity
 CGDebugInfo::EmitNamespaceAlias(const NamespaceAliasDecl &NA) {
   if (CGM.getCodeGenOpts().getDebugInfo() < CodeGenOptions::LimitedDebugInfo)
-    return llvm::DIImportedEntity(nullptr);
+    return llvm::DIImportedEntity();
   auto &VH = NamespaceAliasCache[&NA];
   if (VH)
     return llvm::DIImportedEntity(cast<llvm::MDNode>(VH));
-  llvm::DIImportedEntity R(nullptr);
+  llvm::DIImportedEntity R;
   if (const NamespaceAliasDecl *Underlying =
           dyn_cast<NamespaceAliasDecl>(NA.getAliasedNamespace()))
     // This could cache & dedup here rather than relying on metadata deduping.