Replace struct assignments with rsSetObject calls.

Bug: 3092382
Change-Id: I63f16a7dac02eb348b87a6225944d48faa615899
diff --git a/slang_rs_backend.cpp b/slang_rs_backend.cpp
index 8dbcf36..db2595d 100644
--- a/slang_rs_backend.cpp
+++ b/slang_rs_backend.cpp
@@ -71,7 +71,7 @@
   if (FD &&
       FD->hasBody() &&
       !SlangRS::IsFunctionInRSHeaderFile(FD, mSourceMgr)) {
-    mRefCount.Init(mContext->getASTContext());
+    mRefCount.Init(mContext->getASTContext(), &mDiags);
     mRefCount.Visit(FD->getBody());
   }
   return;