Revert "Add DataFlow2"

This reverts commit 6a0203f33303847d9e7006ca67b1dba31428748b.

ql/src/go.qll

@@ -19,7 +19,6 @@ import semmle.go.controlflow.BasicBlocks
 import semmle.go.controlflow.ControlFlowGraph
 import semmle.go.controlflow.IR
 import semmle.go.dataflow.DataFlow
-import semmle.go.dataflow.DataFlow2
 import semmle.go.dataflow.GlobalValueNumbering
 import semmle.go.dataflow.TaintTracking
 import semmle.go.dataflow.SSA

ql/src/semmle/go/dataflow/DataFlow2.qll

@@ -1,23 +0,0 @@
-/**
- * Provides a library for local (intra-procedural) and global (inter-procedural)
- * data flow analysis: deciding whether data can flow from a _source_ to a
- * _sink_.
- *
- * Unless configured otherwise, _flow_ means that the exact value of
- * the source may reach the sink. We do not track flow across pointer
- * dereferences or array indexing. To track these types of flow, where the
- * exact value may not be preserved, import
- * `semmle.code.go.dataflow.TaintTracking`.
- *
- * To use global (interprocedural) data flow, extend the class
- * `DataFlow::Configuration` as documented on that class. To use local
- * (intraprocedural) data flow, invoke `DataFlow::localFlow` or
- * `DataFlow::LocalFlowStep` with arguments of type `DataFlow::Node`.
- */
-
-import go
-
-module DataFlow2 {
-  import semmle.go.dataflow.internal.DataFlowImpl2
-  import Properties
-}