[lldb][NFC] Remove all uses of StringRef::withNullAsEmpty in LLDB

A long time ago LLDB wanted to start using StringRef instead of
C-Strings/ConstString but was blocked by the fact that the StringRef constructor
that takes a C-string was asserting that the C-string isn't a nullptr. To
workaround this, D24697 introduced a special function called `withNullAsEmpty`
and that's what LLDB (and only LLDB) started to use to build StringRefs from
C-strings.

A bit later it seems that `withNullAsEmpty` was declared too awkward to use and
instead the assert in the StringRef constructor got removed (see D24904). The
rest of LLDB was then converted to StringRef by just calling the now perfectly
usable implicit constructor.

However, all the calls to `withNullAsEmpty` just remained and are now just
strange artefacts in the code base that just look out of place. It's also
curiously a LLDB-exclusive function and no other project ever called it since
it's introduction half a decade ago.

This patch removes all uses of `withNullAsEmpty`. The follow up will be to
remove the function from StringRef.

Reviewed By: JDevlieghere

Differential Revision: https://reviews.llvm.org/D102597

1 files changed, 6 insertions, 6 deletions

diff --git a/lldb/source/Interpreter/CommandInterpreter.cpp b/lldb/source/Interpreter/CommandInterpreter.cpp
index a7aea8d..8122084 100644
--- a/lldb/source/Interpreter/CommandInterpreter.cpp
+++ b/lldb/source/Interpreter/CommandInterpreter.cpp
@@ -2986,9 +2986,9 @@ void CommandInterpreter::GetLLDBCommandsFromIOHandler(
   IOHandlerSP io_handler_sp(
       new IOHandlerEditline(debugger, IOHandler::Type::CommandList,
                             "lldb", // Name of input reader for history
-                            llvm::StringRef::withNullAsEmpty(prompt), // Prompt
-                            llvm::StringRef(), // Continuation prompt
-                            true,              // Get multiple lines
+                            llvm::StringRef(prompt), // Prompt
+                            llvm::StringRef(),       // Continuation prompt
+                            true,                    // Get multiple lines
                             debugger.GetUseColor(),
                             0,         // Don't show line numbers
                             delegate,  // IOHandlerDelegate
@@ -3006,9 +3006,9 @@ void CommandInterpreter::GetPythonCommandsFromIOHandler(
   IOHandlerSP io_handler_sp(
       new IOHandlerEditline(debugger, IOHandler::Type::PythonCode,
                             "lldb-python", // Name of input reader for history
-                            llvm::StringRef::withNullAsEmpty(prompt), // Prompt
-                            llvm::StringRef(), // Continuation prompt
-                            true,              // Get multiple lines
+                            llvm::StringRef(prompt), // Prompt
+                            llvm::StringRef(),       // Continuation prompt
+                            true,                    // Get multiple lines
                             debugger.GetUseColor(),
                             0,         // Don't show line numbers
                             delegate,  // IOHandlerDelegate