Initial version of ValueNumbering interface

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@3538 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/include/llvm/Analysis/ValueNumbering.h b/include/llvm/Analysis/ValueNumbering.h
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+++ b/include/llvm/Analysis/ValueNumbering.h
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+//===- llvm/Analysis/ValueNumbering.h - Value #'ing Interface ---*- C++ -*-===//
+//
+// This file defines the abstract ValueNumbering interface, which is used as the
+// common interface used by all clients of value numbering information, and
+// implemented by all value numbering implementations.
+//
+// Implementations of this interface must implement the various virtual methods,
+// which automatically provides functionality for the entire suite of client
+// APIs.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_ANALYSIS_VALUE_NUMBERING_H
+#define LLVM_ANALYSIS_VALUE_NUMBERING_H
+
+#include <vector>
+class Value;
+
+struct ValueNumbering {
+
+  /// getEqualNumberNodes - Return nodes with the same value number as the
+  /// specified Value.  This fills in the argument vector with any equal values.
+  ///
+  virtual void getEqualNumberNodes(Value *V1,
+                                   std::vector<Value*> &RetVals) const = 0;
+
+  virtual ~ValueNumbering();    // We want to be subclassed
+};
+
+#endif