Remove more pieces of setRoot.  Add pointer to allocation lookup for scripts.

Change-Id: I2c3075d2056f02bb834bfad403dc72da991f3156
diff --git a/rsScriptC_Lib.cpp b/rsScriptC_Lib.cpp
index 0e09474..19dfaff 100644
--- a/rsScriptC_Lib.cpp
+++ b/rsScriptC_Lib.cpp
@@ -1113,6 +1113,14 @@
     return a / b;
 }
 
+int SC_getAllocation(const void *ptr)
+{
+    GET_TLS();
+    const Allocation *alloc = sc->ptrToAllocation(ptr);
+    return (int)alloc;
+}
+
+
 //////////////////////////////////////////////////////////////////////////////
 // Class implementation
 //////////////////////////////////////////////////////////////////////////////
@@ -1368,6 +1376,8 @@
     { "debugPi", (void *)&SC_debugPi },
 
     { "scriptCall", (void *)&SC_scriptCall },
+    { "rsGetAllocation", (void *)&SC_getAllocation },
+
 
     { NULL, NULL }
 };