[OpenMP] Mark Failing OpenMP Tests as XFAIL on Windows (#129040)

This patch marks specific OpenMP runtime tests as XFAIL on Windows due
to failures reported in #129023

openmp/runtime/test/lit.cfg

@@ -137,6 +137,9 @@ if config.operating_system in ['Windows', 'Linux', 'FreeBSD', 'NetBSD', 'DragonF
 if config.operating_system in ['Linux']:
     config.available_features.add('hidden-helper')
 
+if config.compiler_frontend_variant == 'MSVC' or config.compiler_simulate_id == 'MSVC':
+    config.available_features.add("msvc")
+
 target_arch = getattr(config, 'target_arch', None)
 if target_arch:
   config.available_features.add(target_arch + '-target-arch')

openmp/runtime/test/lit.site.cfg.in

@@ -21,6 +21,8 @@ config.has_libatomic = @LIBOMP_HAVE_LIBATOMIC@
 config.is_standalone_build = @OPENMP_STANDALONE_BUILD@
 config.has_omit_frame_pointer_flag = @OPENMP_TEST_COMPILER_HAS_OMIT_FRAME_POINTER_FLAGS@
 config.target_arch = "@LIBOMP_ARCH@"
+config.compiler_frontend_variant = "@CMAKE_C_COMPILER_FRONTEND_VARIANT@"
+config.compiler_simulate_id = "@CMAKE_C_SIMULATE_ID@"
 
 # Let the main config do the real work.
 lit_config.load_config(config, "@LIBOMP_BASE_DIR@/test/lit.cfg")

openmp/runtime/test/transform/interchange/iterfor.cpp

@@ -1,3 +1,5 @@
+// XFAIL: msvc
+// Fails on windows due to issue #129023
 // RUN: %libomp-cxx20-compile-and-run | FileCheck %s --match-full-lines
 
 #ifndef HEADER

openmp/runtime/test/transform/tile/iterfor.cpp

@@ -1,3 +1,5 @@
+// XFAIL: msvc
+// Fails on windows due to issue #129023
 // RUN: %libomp-cxx20-compile-and-run | FileCheck %s --match-full-lines
 
 #ifndef HEADER

openmp/runtime/test/worksharing/for/omp_for_collapse_LowerTriangularLess.c

@@ -1,3 +1,5 @@
+// XFAIL: msvc
+// Fails on windows due to issue #129023
 // RUN: %libomp-compile-and-run
 #include <stdio.h>
 #include <stdlib.h>

openmp/runtime/test/worksharing/for/omp_for_collapse_LowerTriangularLessEqual.c

@@ -1,3 +1,5 @@
+// XFAIL: msvc
+// Fails on windows due to issue #129023
 // RUN: %libomp-compile-and-run
 #include <stdio.h>
 #include <stdlib.h>

openmp/runtime/test/worksharing/for/omp_for_collapse_UpperTriangular.c

@@ -1,3 +1,5 @@
+// XFAIL: msvc
+// Fails on windows due to issue #129023
 // RUN: %libomp-compile-and-run
 #include <stdio.h>
 #include <stdlib.h>