[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, 4 insertions, 4 deletions

diff --git a/lldb/source/DataFormatters/StringPrinter.cpp b/lldb/source/DataFormatters/StringPrinter.cpp
index 4dfe0250c3b..27d649bfc37 100644
--- a/lldb/source/DataFormatters/StringPrinter.cpp
+++ b/lldb/source/DataFormatters/StringPrinter.cpp
@@ -271,7 +271,7 @@ static bool DumpUTFBufferToStream(
                                               llvm::ConversionFlags),
     const StringPrinter::ReadBufferAndDumpToStreamOptions &dump_options) {
   Stream &stream(*dump_options.GetStream());
-  if (dump_options.GetPrefixToken() != 0)
+  if (dump_options.GetPrefixToken() != nullptr)
     stream.Printf("%s", dump_options.GetPrefixToken());
   if (dump_options.GetQuote() != 0)
     stream.Printf("%c", dump_options.GetQuote());
@@ -373,7 +373,7 @@ static bool DumpUTFBufferToStream(
   }
   if (dump_options.GetQuote() != 0)
     stream.Printf("%c", dump_options.GetQuote());
-  if (dump_options.GetSuffixToken() != 0)
+  if (dump_options.GetSuffixToken() != nullptr)
     stream.Printf("%s", dump_options.GetSuffixToken());
   if (dump_options.GetIsTruncated())
     stream.Printf("...");
@@ -449,7 +449,7 @@ bool StringPrinter::ReadStringAndDumpToStream<
   const char *prefix_token = options.GetPrefixToken();
   char quote = options.GetQuote();
 
-  if (prefix_token != 0)
+  if (prefix_token != nullptr)
     options.GetStream()->Printf("%s%c", prefix_token, quote);
   else if (quote != 0)
     options.GetStream()->Printf("%c", quote);
@@ -497,7 +497,7 @@ bool StringPrinter::ReadStringAndDumpToStream<
 
   const char *suffix_token = options.GetSuffixToken();
 
-  if (suffix_token != 0)
+  if (suffix_token != nullptr)
     options.GetStream()->Printf("%c%s", quote, suffix_token);
   else if (quote != 0)
     options.GetStream()->Printf("%c", quote);