Use _icd2_tag fields from KhronosGroup/OpenCL-Headers#280.

Author: Kerilk

loader/icd.c

@@ -159,7 +159,7 @@ void khrIcdVendorAdd(const char *libraryName)
            KHR_ICD_TRACE("found icd 2 object, but platform is missing clIcdSetPlatformDispatchDataKHR\n");
            continue;
         }
-        if (KHR_ICD2_HAS_TAG(platforms[i]) && !((intptr_t)((platforms[i])->dispatch->clUnloadCompiler) == CL_ICD2_TAG_KHR))
+        if (KHR_ICD2_HAS_TAG(platforms[i]) && !(platforms[i]->dispatch->clUnloadCompiler_icd2_tag == CL_ICD2_TAG_KHR))
         {
            KHR_ICD_TRACE("found icd 2 object, but platform is missing tag in clUnloadCompiler\n");
            continue;

loader/icd_dispatch.h

@@ -74,7 +74,7 @@ struct KHRDisp
 };
 
 #define KHR_ICD2_HAS_TAG(object)                                               \
-(((intptr_t)((object)->dispatch->clGetPlatformIDs)) == CL_ICD2_TAG_KHR)
+((object)->dispatch->clGetPlatformIDs_icd2_tag == CL_ICD2_TAG_KHR)
 
 #define KHR_ICD2_DISPATCH(object)                                              \
 (KHR_ICD2_HAS_TAG(object) ?                                                    \