[NFC][lldb] Inclusive language: remove instances of master from comments in lldb

[quinnp]

Summary

[NFC] As part of using inclusive language within the llvm project, this patch
replaces master in these comments.

[clayborg]

Suggested different replacement strings for the comments.

lldb/source/Core/Debugger.cpp

491

lldb/source/Plugins/SymbolFile/DWARF/SymbolFileDWARF.cpp

2588

[quinnp]

Addressing review comments.

[quinnp]

Thanks @clayborg! I've updated the patch based on your suggestions.

lldb/source/Core/Debugger.cpp

void Debugger::Initialize(LoadPluginCallbackType load_plugin_callback) {
   g_load_plugin_callback = load_plugin_callback;
 }
 
 void Debugger::Terminate() {
   assert(g_debugger_list_ptr &&
          "Debugger::Terminate called without a matching Debugger::Initialize!");
 
   if (g_debugger_list_ptr && g_debugger_list_mutex_ptr) {
-    // Clear our master list of debugger objects
+    // Clear our global list of debugger objects
     {
       std::lock_guard<std::recursive_mutex> guard(*g_debugger_list_mutex_ptr);
       for (const auto &debugger : *g_debugger_list_ptr)
         debugger->Clear();
       g_debugger_list_ptr->clear();
     }
   }
 }

lldb/source/Plugins/SymbolFile/DWARF/SymbolFileDWARF.cpp

if (type_ptr == nullptr) {
       }
       SymbolContext sc_backup = sc;
       if (resolve_function_context && parent_die != nullptr &&
           !GetFunction(DWARFDIE(die.GetCU(), parent_die), sc))
         sc = sc_backup;
 
       type_sp = ParseType(sc, die, nullptr);
     } else if (type_ptr != DIE_IS_BEING_PARSED) {
-      // Grab the existing type from the master types lists
+      // Get the original shared pointer for this type
       type_sp = type_ptr->shared_from_this();
     }
   }
   return type_sp;
 }
 
 DWARFDIE
 SymbolFileDWARF::GetDeclContextDIEContainingDIE(const DWARFDIE &orig_die) {