[lldb][Format][NFC] Remove unused FormatEntity::FormatCString

One can use `FormatStringRef` instead anyway

(cherry picked from commit cbbf562)

Author: Michael137

lldb/include/lldb/Core/FormatEntity.h

@@ -218,11 +218,6 @@ bool FormatStringRef(const llvm::StringRef &format, Stream &s,
                      const Address *addr, ValueObject *valobj,
                      bool function_changed, bool initial_function);
 
-bool FormatCString(const char *format, Stream &s, const SymbolContext *sc,
-                   const ExecutionContext *exe_ctx, const Address *addr,
-                   ValueObject *valobj, bool function_changed,
-                   bool initial_function);
-
 Status Parse(const llvm::StringRef &format, Entry &entry);
 
 Status ExtractVariableInfo(llvm::StringRef &format_str,

lldb/source/Core/FormatEntity.cpp

@@ -1237,23 +1237,6 @@ bool FormatEntity::FormatStringRef(const llvm::StringRef &format_str, Stream &s,
   return false;
 }
 
-bool FormatEntity::FormatCString(const char *format, Stream &s,
-                                 const SymbolContext *sc,
-                                 const ExecutionContext *exe_ctx,
-                                 const Address *addr, ValueObject *valobj,
-                                 bool function_changed, bool initial_function) {
-  if (format && format[0]) {
-    FormatEntity::Entry root;
-    llvm::StringRef format_str(format);
-    Status error = FormatEntity::Parse(format_str, root);
-    if (error.Success()) {
-      return FormatEntity::Format(root, s, sc, exe_ctx, addr, valobj,
-                                  function_changed, initial_function);
-    }
-  }
-  return false;
-}
-
 bool FormatEntity::Format(const Entry &entry, Stream &s,
                           const SymbolContext *sc,
                           const ExecutionContext *exe_ctx, const Address *addr,