Put global classes into the appropriate namespace.

Most of the cases belong into an anonymous namespace. No functionality
change intended.

llvm-svn: 251514
diff --git a/clang/lib/Driver/Tools.cpp b/clang/lib/Driver/Tools.cpp
index 1c6f86f..e90e616 100644
--- a/clang/lib/Driver/Tools.cpp
+++ b/clang/lib/Driver/Tools.cpp
@@ -5369,12 +5369,14 @@
   return !HaveDash;
 }
 
+namespace {
 struct EHFlags {
   EHFlags() : Synch(false), Asynch(false), NoExceptC(false) {}
   bool Synch;
   bool Asynch;
   bool NoExceptC;
 };
+} // end anonymous namespace
 
 /// /EH controls whether to run destructor cleanups when exceptions are
 /// thrown.  There are three modifiers: