Start the lifetime of the texture reference

reinterpret_cast<> doesn't create an object, so the texref is actually unitiliazed. This may lead to garbage data in some of its struct members.

Initialize it by performing a placement new. The constructer should set all of its members to default values. There's no way currently to extract the channel type, so use single channel char for now.

Change-Id: I41b305a75bb3f30130324de785099f55b3e130c7

vdi/hip_module.cpp

@@ -528,6 +528,10 @@ hipError_t hipModuleGetTexRef(textureReference** texRef, hipModule_t hmod, const
     HIP_RETURN(hipErrorNotFound);
   }
 
+  // Texture references created by HIP driver API
+  // have the default read mode set to normalized float.
+  (*texRef)->readMode = hipReadModeNormalizedFloat;
+
   HIP_RETURN(hipSuccess);
 }