[Flang][OpenMP] Fix GenASiS failure for HSA_XNACK=1 (llvm#2308)

The previous downstream fix
( https://github.com/AMD-Lightning-Internal/llvm-project/pull/2114 )
enabled the GenASiS benchmark for HSA_XNACK=1
if it is compiled with the -fopenmp-force-usm mode. This downstream fix
supports zero-copy for the GenASiS benchmark without the need for
recompilation.

Author: DominikAdamski

offload/libomptarget/omptarget.cpp

@@ -600,8 +600,8 @@ postProcessingTargetDataEnd(DeviceTy *Device,
         // TODO/FIXME: Look into a better longterm solution, such as a different
         // mapping combination for descriptors or performing a similar base
         // address skip that we've done elsewhere in the omptarget runtime.
-        bool isUSMMode = PM->getRequirements() & OMP_REQ_UNIFIED_SHARED_MEMORY;
-        if ((*ShadowPtr.HstPtrAddr == nullptr || isUSMMode) &&
+        bool isZeroCopy = PM->getRequirements() & OMPX_REQ_AUTO_ZERO_COPY;
+        if ((*ShadowPtr.HstPtrAddr == nullptr || isZeroCopy) &&
             ShadowPtr.IsDescriptorBaseAddr)
           return OFFLOAD_SUCCESS;
         *ShadowPtr.HstPtrAddr = ShadowPtr.HstPtrVal;
@@ -854,9 +854,9 @@ static int targetDataContiguous(ident_t *Loc, DeviceTy &Device, void *ArgsBase,
               // different mapping combination for descriptors or performing a
               // similar base address skip that we've done elsewhere in the
               // omptarget runtime.
-              bool isUSMMode =
-                  PM->getRequirements() & OMP_REQ_UNIFIED_SHARED_MEMORY;
-              if ((*ShadowPtr.HstPtrAddr == nullptr || isUSMMode) &&
+              bool isZeroCopy =
+                  PM->getRequirements() & OMPX_REQ_AUTO_ZERO_COPY;
+              if ((*ShadowPtr.HstPtrAddr == nullptr || isZeroCopy) &&
                   ShadowPtr.IsDescriptorBaseAddr)
                 return OFFLOAD_SUCCESS;
               *ShadowPtr.HstPtrAddr = ShadowPtr.HstPtrVal;