[lldb] Add missing nullptr checks when colouring symbol output

This adds some checks missed by c90cb6e,
probably because some tests only run on certain platforms.

Author: DavidSpickett

lldb/source/Core/Address.cpp

@@ -516,10 +516,14 @@ bool Address::Dump(Stream *s, ExecutionContextScope *exe_scope, DumpStyle style,
               if (symbol) {
                 const char *symbol_name = symbol->GetName().AsCString();
                 if (symbol_name) {
-                  llvm::StringRef ansi_prefix =
-                      target->GetDebugger().GetRegexMatchAnsiPrefix();
-                  llvm::StringRef ansi_suffix =
-                      target->GetDebugger().GetRegexMatchAnsiSuffix();
+                  llvm::StringRef ansi_prefix;
+                  llvm::StringRef ansi_suffix;
+                  if (target) {
+                    ansi_prefix =
+                        target->GetDebugger().GetRegexMatchAnsiPrefix();
+                    ansi_suffix =
+                        target->GetDebugger().GetRegexMatchAnsiSuffix();
+                  }
                   s->PutCStringColorHighlighted(symbol_name, pattern,
                                                 ansi_prefix, ansi_suffix);
                   addr_t delta =

lldb/source/Symbol/Symbol.cpp

@@ -254,8 +254,12 @@ void Symbol::GetDescription(Stream *s, lldb::DescriptionLevel level,
       s->Printf(", value = 0x%16.16" PRIx64,
                 m_addr_range.GetBaseAddress().GetOffset());
   }
-  llvm::StringRef ansi_prefix = target->GetDebugger().GetRegexMatchAnsiPrefix();
-  llvm::StringRef ansi_suffix = target->GetDebugger().GetRegexMatchAnsiSuffix();
+  llvm::StringRef ansi_prefix;
+  llvm::StringRef ansi_suffix;
+  if (target) {
+    ansi_prefix = target->GetDebugger().GetRegexMatchAnsiPrefix();
+    ansi_suffix = target->GetDebugger().GetRegexMatchAnsiSuffix();
+  }
   if (ConstString demangled = m_mangled.GetDemangledName()) {
     s->PutCString(", name=\"");
     s->PutCStringColorHighlighted(demangled.GetStringRef(), pattern,