[LLDB] Add type summaries for MSVC STL strings (#143177)

This PR adds type summaries for
`std::{string,wstring,u8string,u16string,u32string}` from the MSVC STL.

See https://github.com/llvm/llvm-project/issues/24834 for the MSVC STL
issue.

The following changes were made:

- `dotest.py` now detects if the MSVC STL is available. It does so by
looking at the target triple, which is an additional argument passed
from Lit. It specifically checks for `windows-msvc` to not match on
`windows-gnu` (i.e. MinGW/Cygwin).
- (The main part): Added support for summarizing `std::(w)string` from
MSVC's STL. Because the type names from the libstdc++ (pre C++ 11)
string types are the same as on MSVC's STL, `CXXCompositeSummaryFormat`
is used with two entries, one for MSVC's STL and one for libstdc++.
With MSVC's STL, `std::u{8,16,32}string` is also handled. These aren't
handled for libstdc++, so I put them in `LoadMsvcStlFormatters`.

1 files changed, 0 insertions, 1 deletions

diff --git a/lldb/test/API/functionalities/data-formatter/stringprinter/TestStringPrinter.py b/lldb/test/API/functionalities/data-formatter/stringprinter/TestStringPrinter.py
index 27285949c52b..0e3bfc2733a5 100644
--- a/lldb/test/API/functionalities/data-formatter/stringprinter/TestStringPrinter.py
+++ b/lldb/test/API/functionalities/data-formatter/stringprinter/TestStringPrinter.py
@@ -4,5 +4,4 @@ from lldbsuite.test import decorators
 lldbinline.MakeInlineTest(
     __file__,
     globals(),
-    [decorators.expectedFailureAll(oslist=["windows"], bugnumber="llvm.org/pr24772")],
 )