Basic: import SmallString<> into clang namespace

(I was going to fix the TODO about DenseMap too, but
that would break self-host right now. See PR11922.)

llvm-svn: 149799

clang/lib/Sema/SemaExceptionSpec.cpp

@@ -187,7 +187,7 @@ bool Sema::CheckEquivalentExceptionSpec(FunctionDecl *Old, FunctionDecl *New) {
     } 
 
     // Warn about the lack of exception specification.
-    llvm::SmallString<128> ExceptionSpecString;
+    SmallString<128> ExceptionSpecString;
     llvm::raw_svector_ostream OS(ExceptionSpecString);
     switch (OldProto->getExceptionSpecType()) {
     case EST_DynamicNone: