[Clang][Bundler] Replace std::vector by SmallVector [NFC]

[Hahnfeld]

LGTM

cfe/trunk/tools/clang-offload-bundler/ClangOffloadBundler.cpp

 /// single one. Also the implements the opposite functionality, i.e. unbundle
 /// files previous created by this tool.
 ///
 //===----------------------------------------------------------------------===//
 
 #include "clang/Basic/Version.h"
 #include "llvm/ADT/ArrayRef.h"
 #include "llvm/ADT/SmallString.h"
+#include "llvm/ADT/SmallVector.h"
 #include "llvm/ADT/StringMap.h"
 #include "llvm/ADT/StringRef.h"
 #include "llvm/ADT/StringSwitch.h"
 #include "llvm/ADT/Triple.h"
 #include "llvm/Object/Binary.h"
 #include "llvm/Object/ObjectFile.h"
 #include "llvm/Support/Casting.h"
 #include "llvm/Support/CommandLine.h"
 #include "llvm/Support/Error.h"
 #include "llvm/Support/ErrorOr.h"
 #include "llvm/Support/FileSystem.h"
 #include "llvm/Support/MemoryBuffer.h"
 #include "llvm/Support/Path.h"
 #include "llvm/Support/Program.h"
 #include "llvm/Support/raw_ostream.h"
 #include "llvm/Support/Signals.h"
 #include "llvm/Support/StringSaver.h"
 #include <algorithm>
 #include <cassert>
 #include <cstddef>
 #include <cstdint>
 #include <memory>
 #include <string>
 #include <system_error>
-#include <vector>
 
 using namespace llvm;
 using namespace llvm::object;
 
 static cl::opt<bool> Help("h", cl::desc("Alias for -help"), cl::Hidden);
 
 // Mark all our options with this category, everything else (except for -version
 // and -help) will be hidden.
static bool BundleFiles() {
   raw_fd_ostream OutputFile(OutputFileNames.front(), EC, sys::fs::OF_None);
 
   if (EC) {
     errs() << "error: Can't open file " << OutputFileNames.front() << ".\n";
     return true;
   }
 
   // Open input files.
-  std::vector<std::unique_ptr<MemoryBuffer>> InputBuffers(
-      InputFileNames.size());
-
-  unsigned Idx = 0;
+  SmallVector<std::unique_ptr<MemoryBuffer>, 8u> InputBuffers;
+  InputBuffers.reserve(InputFileNames.size());
   for (auto &I : InputFileNames) {
     ErrorOr<std::unique_ptr<MemoryBuffer>> CodeOrErr =
         MemoryBuffer::getFileOrSTDIN(I);
     if (std::error_code EC = CodeOrErr.getError()) {
       errs() << "error: Can't open file " << I << ": " << EC.message() << "\n";
       return true;
     }
-    InputBuffers[Idx++] = std::move(CodeOrErr.get());
+    InputBuffers.emplace_back(std::move(CodeOrErr.get()));
   }
 
   // Get the file handler. We use the host buffer as reference.
   assert(HostInputIndex != ~0u && "Host input index undefined??");
   std::unique_ptr<FileHandler> FH;
   FH.reset(CreateFileHandler(*InputBuffers[HostInputIndex].get()));
 
   // Quit if we don't have a handler.