[NFC] Update tests

Clean up XFAIL (test now passes) and remove non-valid check

Author: mdtoguchi

clang/test/Driver/sycl-offload-header-check.cpp

@@ -9,7 +9,6 @@
 // RUN: env TMP=%t_dirname  \
 // RUN: %clang -### -fsycl %s 2>&1 | \
 // RUN: FileCheck --check-prefix=CHECK-HEADER %s
-// CHECK-HEADER-NOT: non-portable path
 // CHECK-HEADER: clang{{.*}} "-fsycl-int-header=[[HEADER:.+\.h]]"
 // CHECK-HEADER: {{.*}} "-internal-isystem" "{{.*}}bin{{[/\\]+}}..{{[/\\]+}}include{{[/\\]+}}sycl"
 // CHECK-HEADER-NOT: clang{{.*}} "-include" "[[HEADER]]"

sycl/test/regression/fsycl-save-temps.cpp

@@ -20,8 +20,3 @@ int main() {
   });
   return 0;
 }
-
-// TODO: Address a Windows-specific issue with integration header filenames
-// XFAIL: system-windows && !level_zero
-// TODO: fail is flaky on Windows for Level Zero. Enable when fixed.
-// UNSUPPORTED: system-windows && level_zero