[lldb] Fix stdcpp type summary mistakenly marked as regex (NFC)

[kastiglione]

Summary

std::basic_string<char> is not a regex, and treating it as such could unintentionally
cause a formatter to substring match a template type parameter, for example:
std::vector<std::basic_string<char>>.

[kastiglione]

Merged in https://github.com/llvm/llvm-project/pull/66949

lldb/source/Plugins/Language/CPlusPlus/CPlusPlusLanguage.cpp

lldb::TypeSummaryImplSP cxx11_string_summary_sp(new CXXFunctionSummaryFormat(
       "libstdc++ c++11 std::string summary provider"));
   lldb::TypeSummaryImplSP cxx11_wstring_summary_sp(new CXXFunctionSummaryFormat(
       stl_summary_flags, LibStdcppWStringSummaryProvider,
       "libstdc++ c++11 std::wstring summary provider"));
 
   cpp_category_sp->AddTypeSummary("std::string", eFormatterMatchExact,
                                   std_string_summary_sp);
   cpp_category_sp->AddTypeSummary("std::basic_string<char>",
-                                  eFormatterMatchRegex, std_string_summary_sp);
+                                  eFormatterMatchExact, std_string_summary_sp);
   cpp_category_sp->AddTypeSummary(
       "std::basic_string<char,std::char_traits<char>,std::allocator<char> >",
       eFormatterMatchExact, std_string_summary_sp);
   cpp_category_sp->AddTypeSummary(
       "std::basic_string<char, std::char_traits<char>, std::allocator<char> >",
       eFormatterMatchExact, std_string_summary_sp);
 
   cpp_category_sp->AddTypeSummary("std::__cxx11::string", eFormatterMatchExact,