[lldb] NFC modernize codebase with modernize-use-nullptr

Summary:
NFC = [[ https://llvm.org/docs/Lexicon.html#nfc | Non functional change ]]

This commit is the result of modernizing the LLDB codebase by using
`nullptr` instread of `0` or `NULL`. See
https://clang.llvm.org/extra/clang-tidy/checks/modernize-use-nullptr.html
for more information.

This is the command I ran and I to fix and format the code base:

```
run-clang-tidy.py \
	-header-filter='.*' \
	-checks='-*,modernize-use-nullptr' \
	-fix ~/dev/llvm-project/lldb/.* \
	-format \
	-style LLVM \
	-p ~/llvm-builds/debug-ninja-gcc
```

NOTE: There were also changes to `llvm/utils/unittest` but I did not
include them because I felt that maybe this library shall be updated in
isolation somehow.

NOTE: I know this is a rather large commit but it is a nobrainer in most
parts.

Reviewers: martong, espindola, shafik, #lldb, JDevlieghere

Reviewed By: JDevlieghere

Subscribers: arsenm, jvesely, nhaehnle, hiraditya, JDevlieghere, teemperor, rnkovacs, emaste, kubamracek, nemanjai, ki.stfu, javed.absar, arichardson, kbarton, jrtc27, MaskRay, atanasyan, dexonsmith, arphaman, jfb, jsji, jdoerfert, lldb-commits, llvm-commits

Tags: #lldb, #llvm

Differential Revision: https://reviews.llvm.org/D61847

llvm-svn: 361484

1 files changed, 2 insertions, 2 deletions

diff --git a/lldb/source/Plugins/SystemRuntime/MacOSX/AppleGetQueuesHandler.cpp b/lldb/source/Plugins/SystemRuntime/MacOSX/AppleGetQueuesHandler.cpp
index 2b6c553dd43..e1dabae0d58 100644
--- a/lldb/source/Plugins/SystemRuntime/MacOSX/AppleGetQueuesHandler.cpp
+++ b/lldb/source/Plugins/SystemRuntime/MacOSX/AppleGetQueuesHandler.cpp
@@ -158,7 +158,7 @@ AppleGetQueuesHandler::SetupGetQueuesFunction(Thread &thread,
     // First stage is to make the ClangUtility to hold our injected function:
 
     if (!m_get_queues_impl_code_up) {
-      if (g_get_current_queues_function_code != NULL) {
+      if (g_get_current_queues_function_code != nullptr) {
         Status error;
         m_get_queues_impl_code_up.reset(
             exe_ctx.GetTargetRef().GetUtilityFunctionForLanguage(
@@ -335,7 +335,7 @@ AppleGetQueuesHandler::GetCurrentQueues(Thread &thread, addr_t page_to_free,
   FunctionCaller *get_queues_caller =
       m_get_queues_impl_code_up->GetFunctionCaller();
 
-  if (get_queues_caller == NULL) {
+  if (get_queues_caller == nullptr) {
     error.SetErrorString(
         "Unable to get caller for call __introspection_dispatch_get_queues");
     return return_value;