tests/tcg/xtensa: add test for failed memory transactions

Failed memory transactions should raise exceptions 14 (for fetch) or 15 (for load/store) with XEA2.

---
 tests/tcg/xtensa/Makefile        |  1 +
 tests/tcg/xtensa/test_phys_mem.S | 68 ++++++++++++++++++++++++++++++++++++++++
 2 files changed, 69 insertions(+)
 create mode 100644 tests/tcg/xtensa/test_phys_mem.S

index 091518c05583..2f5691f75b09 100644
@@ -44,6 +44,7 @@ TESTCASES += test_mmu.tst
 TESTCASES += test_mul16.tst
 TESTCASES += test_mul32.tst
 TESTCASES += test_nsa.tst
+TESTCASES += test_phys_mem.tst
 ifdef XT
 TESTCASES += test_pipeline.tst
 endif

2.11.0