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/FileManager.cpp b/lib/Basic/FileManager.cpp
index 267db48..fd6d334 100644
--- a/lib/Basic/FileManager.cpp
+++ b/lib/Basic/FileManager.cpp
@@ -477,7 +477,7 @@
       || llvm::sys::path::is_absolute(pathRef))
     return;
 
-  llvm::SmallString<128> NewPath(FileSystemOpts.WorkingDir);
+  SmallString<128> NewPath(FileSystemOpts.WorkingDir);
   llvm::sys::path::append(NewPath, pathRef);
   path = NewPath;
 }
@@ -509,7 +509,7 @@
     return Result.take();
   }
 
-  llvm::SmallString<128> FilePath(Entry->getName());
+  SmallString<128> FilePath(Entry->getName());
   FixupRelativePath(FilePath);
   ec = llvm::MemoryBuffer::getFile(FilePath.str(), Result, Entry->getSize());
   if (ec && ErrorStr)
@@ -528,7 +528,7 @@
     return Result.take();
   }
 
-  llvm::SmallString<128> FilePath(Filename);
+  SmallString<128> FilePath(Filename);
   FixupRelativePath(FilePath);
   ec = llvm::MemoryBuffer::getFile(FilePath.c_str(), Result);
   if (ec && ErrorStr)
@@ -549,7 +549,7 @@
     return FileSystemStatCache::get(Path, StatBuf, FileDescriptor,
                                     StatCache.get());
 
-  llvm::SmallString<128> FilePath(Path);
+  SmallString<128> FilePath(Path);
   FixupRelativePath(FilePath);
 
   return FileSystemStatCache::get(FilePath.c_str(), StatBuf, FileDescriptor,
@@ -558,7 +558,7 @@
 
 bool FileManager::getNoncachedStatValue(StringRef Path, 
                                         struct stat &StatBuf) {
-  llvm::SmallString<128> FilePath(Path);
+  SmallString<128> FilePath(Path);
   FixupRelativePath(FilePath);
 
   return ::stat(FilePath.c_str(), &StatBuf) != 0;