Fix format specifier to not trigger an assertion

(cherry picked from commit be53aca)

Author: adrian-prantl

lldb/source/Plugins/LanguageRuntime/Swift/SwiftLanguageRuntimeDynamicTypeResolution.cpp

@@ -577,7 +577,7 @@ class LLDBMemoryReader : public swift::remote::MemoryReader {
                   std::string &dest) override {
     Log *log(GetLogIfAllCategoriesSet(LIBLLDB_LOG_TYPES));
 
-    LLDB_LOGV(log, "[MemoryReader] asked to read string data at address {0x}",
+    LLDB_LOGV(log, "[MemoryReader] asked to read string data at address {0:x}",
               address.getAddressData());
 
     Target &target(m_process.GetTarget());