Add getPointer for USAGE_SHARED allocations.

Change-Id: I13a2af09bbbeec6cc6131b935979ac21c02820be
diff --git a/cpp/RenderScript.cpp b/cpp/RenderScript.cpp
index 04f1e88..5709f79 100644
--- a/cpp/RenderScript.cpp
+++ b/cpp/RenderScript.cpp
@@ -401,6 +401,11 @@
         ALOGV("Couldn't initialize RS::dispatch->AllocationIoReceive");
         return false;
     }
+    RS::dispatch->AllocationGetPointer = (AllocationGetPointerFnPtr)dlsym(handle, "rsAllocationGetPointer");
+    if (RS::dispatch->AllocationGetPointer == NULL) {
+        ALOGV("Couldn't initialize RS::dispatch->AllocationGetPointer");
+        //return false;
+    }
 
     return true;
 }