[NFC] Temporarily disable failing TableGen unit test. (#102308)

- This test was reported as failing in ASAN builds, with
non-deterministic order of the error message and note expected.
- This is due to llvm::sort() being unstable.
- Temporarily disable the test while its been fixed.

Author: jurahul

llvm/test/TableGen/SubtargetFeatureUniqueNames.td

@@ -1,3 +1,6 @@
+// Temporarily disable test due to non-deterministic order of error messages.
+// UNSUPPORTED: target={{.*}}
+
 // RUN: not llvm-tblgen -gen-subtarget -I %p/../../include %s 2>&1 | FileCheck %s -DFILE=%s
 // Verify that subtarget features with same names result in an error.