New file, includes method to merge exit nodes together

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@141 91177308-0d34-0410-b5e6-96231b3b80d8

include/llvm/Analysis/SimplifyCFG.h

@@ -0,0 +1,27 @@
+//===- llvm/Analysis/SimplifyCFG.h - CFG Simplification XForms ---*- C++ -*--=//
+//
+// This file provides several routines that are useful for simplifying CFGs in
+// various ways...
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_ANALYSIS_SIMPLIFY_CFG_H
+#define LLVM_ANALYSIS_SIMPLIFY_CFG_H
+
+class BasicBlock;
+class Method;
+
+namespace cfg {
+
+  // UnifyAllExitNodes - Unify all exit nodes of the CFG by creating a new
+  // BasicBlock, and converting all returns to unconditional branches to this
+  // new basic block.  The singular exit node is returned.
+  //
+  // If there are no return stmts in the Method, a null pointer is returned.
+  //
+  BasicBlock *UnifyAllExitNodes(Method *M);
+
+}  // End Namespace cfg
+
+
+#endif