[Offload][AMDGPU] Flip OMPX_DISABLE_USM_MAPS default value

Change-Id: I3d8f1ad7a853610dc6f72836e8801c428c0a2592

Author: hidekisaito

offload/plugins-nextgen/amdgpu/src/rtl.cpp

@@ -2922,7 +2922,7 @@ struct AMDGPUDeviceTy : public GenericDeviceTy, AMDGenericDeviceTy {
             // setting default to true here appears to solve random sdma problem
             "LIBOMPTARGET_AMDGPU_USE_MULTIPLE_SDMA_ENGINES", false),
         OMPX_ApuMaps("OMPX_APU_MAPS", false),
-        OMPX_DisableUsmMaps("OMPX_DISABLE_USM_MAPS", false),
+        OMPX_DisableUsmMaps("OMPX_DISABLE_USM_MAPS", true),
         OMPX_NoMapChecks("OMPX_DISABLE_MAPS", true),
         OMPX_StrictSanityChecks("OMPX_STRICT_SANITY_CHECKS", false),
         OMPX_SyncCopyBack("LIBOMPTARGET_SYNC_COPY_BACK", true),

offload/test/mapping/coarse_grain.cpp

@@ -1,12 +1,16 @@
 // clang-format off
 // RUN: %libomptarget-compilexx-generic
 // RUN: env HSA_XNACK=1 LIBOMPTARGET_INFO=30 %libomptarget-run-generic 2>&1 \
-// RUN: | %fcheck-generic -check-prefix=CHECK
+// RUN: | %fcheck-generic -check-prefix=CHECK_FINE
 
 // RUN: %libomptarget-compilexx-generic
 // RUN: env OMPX_DISABLE_USM_MAPS=1 HSA_XNACK=1 LIBOMPTARGET_INFO=30 %libomptarget-run-generic 2>&1 \
 // RUN: | %fcheck-generic -check-prefix=CHECK_FINE
 
+// RUN: %libomptarget-compilexx-generic
+// RUN: env OMPX_DISABLE_USM_MAPS=0 HSA_XNACK=1 LIBOMPTARGET_INFO=30 %libomptarget-run-generic 2>&1 \
+// RUN: | %fcheck-generic -check-prefix=CHECK
+
 // UNSUPPORTED: aarch64-unknown-linux-gnu
 // UNSUPPORTED: aarch64-unknown-linux-gnu-LTO
 // UNSUPPORTED: nvptx64-nvidia-cuda