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.)

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@149799 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Basic/IdentifierTable.cpp b/lib/Basic/IdentifierTable.cpp
index bc1f175..8bd7625 100644
--- a/lib/Basic/IdentifierTable.cpp
+++ b/lib/Basic/IdentifierTable.cpp
@@ -356,7 +356,7 @@
 }
 
 std::string MultiKeywordSelector::getName() const {
-  llvm::SmallString<256> Str;
+  SmallString<256> Str;
   llvm::raw_svector_ostream OS(Str);
   for (keyword_iterator I = keyword_begin(), E = keyword_end(); I != E; ++I) {
     if (*I)
@@ -458,7 +458,7 @@
 SelectorTable::constructSetterName(IdentifierTable &Idents,
                                    SelectorTable &SelTable,
                                    const IdentifierInfo *Name) {
-  llvm::SmallString<100> SelectorName;
+  SmallString<100> SelectorName;
   SelectorName = "set";
   SelectorName += Name->getName();
   SelectorName[3] = toupper(SelectorName[3]);