[analyzer] Change the warning message for GCD antipattern checker

llvm-svn: 332544
diff --git a/clang/lib/StaticAnalyzer/Checkers/GCDAntipatternChecker.cpp b/clang/lib/StaticAnalyzer/Checkers/GCDAntipatternChecker.cpp
index 4ee5159..1b7ea53 100644
--- a/clang/lib/StaticAnalyzer/Checkers/GCDAntipatternChecker.cpp
+++ b/clang/lib/StaticAnalyzer/Checkers/GCDAntipatternChecker.cpp
@@ -187,8 +187,8 @@
 
   std::string Diagnostics;
   llvm::raw_string_ostream OS(Diagnostics);
-  OS << "Waiting on a " << Type << " with Grand Central Dispatch creates "
-     << "useless threads and is subject to priority inversion; consider "
+  OS << "Waiting on a callback using a " << Type << " creates useless threads "
+     << "and is subject to priority inversion; consider "
      << "using a synchronous API or changing the caller to be asynchronous";
 
   BR.EmitBasicReport(