[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/Plugins/SymbolFile/DWARF/HashedNameToDIE.cpp b/lldb/source/Plugins/SymbolFile/DWARF/HashedNameToDIE.cpp
index 333e203c928..2cd7c92f1ca 100644
--- a/lldb/source/Plugins/SymbolFile/DWARF/HashedNameToDIE.cpp
+++ b/lldb/source/Plugins/SymbolFile/DWARF/HashedNameToDIE.cpp
@@ -264,7 +264,7 @@ bool DWARFMappedHash::Header::Read(const lldb_private::DWARFDataExtractor &data,
     return false;
 
   for (size_t i = 0; i < num_atoms; ++i) {
-    DWARFFormValue form_value(NULL, header_data.atoms[i].form);
+    DWARFFormValue form_value(nullptr, header_data.atoms[i].form);
 
     if (!form_value.ExtractValue(data, offset_ptr))
       return false;
@@ -341,7 +341,7 @@ DWARFMappedHash::MemoryTable::GetHashDataForName(
   // There definitely should be a string for this string offset, if there
   // isn't, there is something wrong, return and error
   const char *strp_cstr = m_string_table.PeekCStr(pair.key);
-  if (strp_cstr == NULL) {
+  if (strp_cstr == nullptr) {
     *hash_data_offset_ptr = UINT32_MAX;
     return eResultError;
   }
@@ -408,7 +408,7 @@ DWARFMappedHash::MemoryTable::AppendHashDataForRegularExpression(
   // There definitely should be a string for this string offset, if there
   // isn't, there is something wrong, return and error
   const char *strp_cstr = m_string_table.PeekCStr(pair.key);
-  if (strp_cstr == NULL)
+  if (strp_cstr == nullptr)
     return eResultError;
 
   const uint32_t count = m_data.GetU32(hash_data_offset_ptr);