disable the test in USM/memops2d

Author: YixingZhang007

sycl/test-e2e/USM/memops2d/lit.local.cfg

@@ -0,0 +1,5 @@
+# This feature refers to an unsupported capability in the SPIR-V Backend,
+# pending triaging and identifying required features/extensions.
+# Temporarily disabled until the failure is addressed:
+# https://github.com/llvm/llvm-project/issues/127791
+config.unsupported_features += ['spirv-backend']