Expose memory executable bit for SVM ranges

Add support to expose executable bit.

Change-Id: I054f5c3173822c369dd9908eec5c449459600ce1
Signed-off-by: David Yat Sin <David.YatSin@amd.com>

runtime/hsa-runtime/core/runtime/runtime.cpp

@@ -1826,6 +1826,14 @@ hsa_status_t Runtime::SetSvmAttrib(void* ptr, size_t size,
           clear_flags |= HSA_SVM_FLAG_GPU_READ_MOSTLY;
         break;
       }
+      case HSA_AMD_SVM_ATTRIB_GPU_EXEC: {
+        Check(attrib);
+        if (value)
+          set_flags |= HSA_SVM_FLAG_GPU_EXEC;
+        else
+          clear_flags |= HSA_SVM_FLAG_GPU_EXEC;
+        break;
+      }
       case HSA_AMD_SVM_ATTRIB_AGENT_ACCESSIBLE: {
         Agent* agent = Convert(value);
         ConfirmNew(agent);

runtime/hsa-runtime/inc/hsa_ext_amd.h

@@ -2280,6 +2280,9 @@ typedef enum hsa_amd_svm_attribute_s {
   // range will be read operations.
   // Type of this attribute is bool.
   HSA_AMD_SVM_ATTRIB_READ_MOSTLY = 6,
+  // Allows the execution on GPU.
+  // Type of this attribute is bool.
+  HSA_AMD_SVM_ATTRIB_GPU_EXEC = 7,
   // This attribute can not be used in ::hsa_amd_svm_attributes_get.
   // Enables an agent for access to the range.  Access may incur a page fault
   // and associated memory migration.  Either this or