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/CodeGen/CGDebugInfo.cpp b/lib/CodeGen/CGDebugInfo.cpp
index ed27f2d..0ec74cf 100644
--- a/lib/CodeGen/CGDebugInfo.cpp
+++ b/lib/CodeGen/CGDebugInfo.cpp
@@ -131,7 +131,7 @@
 }
 
 StringRef CGDebugInfo::getObjCMethodName(const ObjCMethodDecl *OMD) {
-  llvm::SmallString<256> MethodName;
+  SmallString<256> MethodName;
   llvm::raw_svector_ostream OS(MethodName);
   OS << (OMD->isInstanceMethod() ? '-' : '+') << '[';
   const DeclContext *DC = OMD->getDeclContext();
@@ -254,7 +254,7 @@
 
   if (!CWDName.empty())
     return CWDName;
-  llvm::SmallString<256> CWD;
+  SmallString<256> CWD;
   llvm::sys::fs::current_path(CWD);
   char *CompDirnamePtr = DebugInfoNames.Allocate<char>(CWD.size());
   memcpy(CompDirnamePtr, CWD.data(), CWD.size());
@@ -2403,7 +2403,7 @@
     fields.push_back(fieldType);
   }
 
-  llvm::SmallString<36> typeName;
+  SmallString<36> typeName;
   llvm::raw_svector_ostream(typeName)
     << "__block_literal_" << CGM.getUniqueBlockCount();