[clang][ExtractAPI] Ignore fully anonymous RecordDecls

ExtractAPI was emitting a separate symbol for anonymous record declaration
that define the type of a member of another record declaration. Now
ExtractAPI ignores these declarations and just records the existence of
the actual member.

Differential Revision: https://reviews.llvm.org/D135804

Author: daniel-grumberg

clang/lib/ExtractAPI/ExtractAPIConsumer.cpp

@@ -401,6 +401,9 @@ class ExtractAPIVisitor : public RecursiveASTVisitor<ExtractAPIVisitor> {
     StringRef Name = Decl->getName();
     if (Name.empty())
       Name = getTypedefName(Decl);
+    if (Name.empty())
+      return true;
+
     StringRef USR = API.recordUSR(Decl);
     PresumedLoc Loc =
         Context.getSourceManager().getPresumedLoc(Decl->getLocation());