remove unneeded llvm:: namespace qualifiers on some core types now that LLVM.h imports
them into the clang namespace.

llvm-svn: 135852
diff --git a/clang/lib/Analysis/FormatString.cpp b/clang/lib/Analysis/FormatString.cpp
index 5f3cd4c..3550a54 100644
--- a/clang/lib/Analysis/FormatString.cpp
+++ b/clang/lib/Analysis/FormatString.cpp
@@ -379,7 +379,7 @@
 // Methods on OptionalAmount.
 //===----------------------------------------------------------------------===//
 
-void OptionalAmount::toString(llvm::raw_ostream &os) const {
+void OptionalAmount::toString(raw_ostream &os) const {
   switch (hs) {
   case Invalid:
   case NotSpecified: