Replace NULL with nullptr

Also fixed some lines that were too long, and a few other minor
details.

Change-Id: I6efba5fb6e03eb5d0a300fddb2a75bf8e2f175cb
diff --git a/compiler/driver/compiler_driver.cc b/compiler/driver/compiler_driver.cc
index e665e1d..c858326 100644
--- a/compiler/driver/compiler_driver.cc
+++ b/compiler/driver/compiler_driver.cc
@@ -495,7 +495,8 @@
                                 const std::vector<const DexFile*>& dex_files,
                                 TimingLogger* timings) {
   DCHECK(!Runtime::Current()->IsStarted());
-  std::unique_ptr<ThreadPool> thread_pool(new ThreadPool("Compiler driver thread pool", thread_count_ - 1));
+  std::unique_ptr<ThreadPool> thread_pool(
+      new ThreadPool("Compiler driver thread pool", thread_count_ - 1));
   VLOG(compiler) << "Before precompile " << GetMemoryUsageString(false);
   PreCompile(class_loader, dex_files, thread_pool.get(), timings);
   Compile(class_loader, dex_files, thread_pool.get(), timings);
@@ -2101,7 +2102,8 @@
   VLOG(compiler) << "Compile: " << GetMemoryUsageString(false);
 }
 
-void CompilerDriver::CompileClass(const ParallelCompilationManager* manager, size_t class_def_index) {
+void CompilerDriver::CompileClass(const ParallelCompilationManager* manager,
+                                  size_t class_def_index) {
   ATRACE_CALL();
   const DexFile& dex_file = *manager->GetDexFile();
   const DexFile::ClassDef& class_def = dex_file.GetClassDef(class_def_index);
@@ -2251,7 +2253,7 @@
                    // Is eligable for compilation by methods-to-compile filter.
                    IsMethodToCompile(method_ref);
     if (compile) {
-      // NOTE: if compiler declines to compile this method, it will return nullptr.
+      // NOTE: if compiler declines to compile this method, it will return null.
       compiled_method = compiler_->Compile(code_item, access_flags, invoke_type, class_def_idx,
                                            method_idx, class_loader, dex_file);
     }