[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/Platform/MacOSX/PlatformMacOSX.cpp b/lldb/source/Plugins/Platform/MacOSX/PlatformMacOSX.cpp
index 47b7b9f77eb..5fbb0f1babd 100644
--- a/lldb/source/Plugins/Platform/MacOSX/PlatformMacOSX.cpp
+++ b/lldb/source/Plugins/Platform/MacOSX/PlatformMacOSX.cpp
@@ -183,7 +183,7 @@ ConstString PlatformMacOSX::GetSDKDirectory(lldb_private::Target &target) {
             const char *command = "xcrun -sdk macosx --show-sdk-path";
             lldb_private::Status error = RunShellCommand(
                 command, // shell command to run
-                NULL,    // current working directory
+                nullptr, // current working directory
                 &status, // Put the exit status of the process in here
                 &signo,  // Put the signal that caused the process to exit in
                          // here
@@ -309,7 +309,7 @@ lldb_private::Status PlatformMacOSX::GetSharedModule(
     if (module_spec.GetArchitecture().GetCore() ==
         ArchSpec::eCore_x86_64_x86_64h) {
       ObjectFile *objfile = module_sp->GetObjectFile();
-      if (objfile == NULL) {
+      if (objfile == nullptr) {
         // We didn't find an x86_64h slice, fall back to a x86_64 slice
         ModuleSpec module_spec_x86_64(module_spec);
         module_spec_x86_64.GetArchitecture() = ArchSpec("x86_64-apple-macosx");