[Support] Rename tool_output_file to ToolOutputFile, NFC

This class isn't similar to anything from the STL, so it shouldn't use
the STL naming conventions.

llvm-svn: 314050
diff --git a/llvm/tools/llvm-objdump/MachODump.cpp b/llvm/tools/llvm-objdump/MachODump.cpp
index 006ba57..e9b531f 100644
--- a/llvm/tools/llvm-objdump/MachODump.cpp
+++ b/llvm/tools/llvm-objdump/MachODump.cpp
@@ -5950,7 +5950,7 @@
     errs() << XarEC.message() << "\n";
     return;
   }
-  tool_output_file XarFile(XarFilename, FD);
+  ToolOutputFile XarFile(XarFilename, FD);
   raw_fd_ostream &XarOut = XarFile.os();
   StringRef XarContents(sect, size);
   XarOut << XarContents;