Fix merge issue that caused IO pipe tests breakage

It seems that a 'break' got lost from that switch during the merge
process, which resulted in pipe code getting into swift-error handling
code. This patch adds the missing 'break' back.

Author: vmaksimo

clang/lib/Sema/SemaDeclAttr.cpp

@@ -8230,6 +8230,7 @@ static void ProcessDeclAttribute(Sema &S, Scope *scope, Decl *D,
     break;
   case ParsedAttr::AT_SYCLIntelPipeIO:
     handleSYCLIntelPipeIOAttr(S, D, AL);
+    break;
 
   // Swift attributes.
   case ParsedAttr::AT_SwiftBridge: