[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/Plugins/ExpressionParser/Clang/ClangExpressionVariable.h b/lldb/source/Plugins/ExpressionParser/Clang/ClangExpressionVariable.h
index bb5e6e79870..eb7f74f20a2 100644
--- a/lldb/source/Plugins/ExpressionParser/Clang/ClangExpressionVariable.h
+++ b/lldb/source/Plugins/ExpressionParser/Clang/ClangExpressionVariable.h
@@ -117,8 +117,8 @@ public:
   class ParserVars {
   public:
     ParserVars()
-        : m_parser_type(), m_named_decl(NULL), m_llvm_value(NULL),
-          m_lldb_value(), m_lldb_var(), m_lldb_sym(NULL) {}
+        : m_parser_type(), m_named_decl(nullptr), m_llvm_value(nullptr),
+          m_lldb_value(), m_lldb_var(), m_lldb_sym(nullptr) {}
 
     TypeFromParser
         m_parser_type; ///< The type of the variable according to the parser
@@ -152,7 +152,7 @@ public:
     ParserVarMap::iterator i = m_parser_vars.find(parser_id);
 
     if (i == m_parser_vars.end())
-      return NULL;
+      return nullptr;
     else
       return &i->second;
   }
@@ -186,7 +186,7 @@ public:
     JITVarMap::iterator i = m_jit_vars.find(parser_id);
 
     if (i == m_jit_vars.end())
-      return NULL;
+      return nullptr;
     else
       return &i->second;
   }