[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, 3 insertions, 3 deletions

diff --git a/lldb/source/Interpreter/CommandInterpreter.cpp b/lldb/source/Interpreter/CommandInterpreter.cpp
index f6027636bd3..b951cce8c59 100644
--- a/lldb/source/Interpreter/CommandInterpreter.cpp
+++ b/lldb/source/Interpreter/CommandInterpreter.cpp
@@ -1739,7 +1739,7 @@ bool CommandInterpreter::HandleCommand(const char *command_line,
     log->Printf("HandleCommand, (revised) command_string: '%s'",
                 command_string.c_str());
     const bool wants_raw_input =
-        (cmd_obj != NULL) ? cmd_obj->WantsRawCommandString() : false;
+        (cmd_obj != nullptr) ? cmd_obj->WantsRawCommandString() : false;
     log->Printf("HandleCommand, wants_raw_input:'%s'",
                 wants_raw_input ? "True" : "False");
   }
@@ -2214,7 +2214,7 @@ void CommandInterpreter::SourceInitFileHome(CommandReturnObject &result) {
 
 const char *CommandInterpreter::GetCommandPrefix() {
   const char *prefix = GetDebugger().GetIOHandlerCommandPrefix();
-  return prefix == NULL ? "" : prefix;
+  return prefix == nullptr ? "" : prefix;
 }
 
 PlatformSP CommandInterpreter::GetPlatform(bool prefer_target_platform) {
@@ -3206,7 +3206,7 @@ CommandInterpreter::ResolveCommandImpl(std::string &command_line,
   if (!scratch_command.empty())
     revised_command_line.Printf(" %s", scratch_command.c_str());
 
-  if (cmd_obj != NULL)
+  if (cmd_obj != nullptr)
     command_line = revised_command_line.GetString();
 
   return cmd_obj;