Lett users of sparse propagation do their own thing with phi nodes if they want

to. This can be combined with LCSSA or SSI form to store more information on a
PHINode than can be computed by looking at its incoming values.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@82317 91177308-0d34-0410-b5e6-96231b3b80d8

include/llvm/Analysis/SparsePropagation.h

@@ -72,6 +72,12 @@ public:
   virtual LatticeVal ComputeConstant(Constant *C) {
     return getOverdefinedVal(); // always safe
   }
+
+  /// IsSpecialCasedPHI - Given a PHI node, determine whether this PHI node is
+  /// one that the we want to handle through ComputeInstructionState.
+  virtual bool IsSpecialCasedPHI(PHINode *PN) {
+    return false;
+  }
   
   /// GetConstant - If the specified lattice value is representable as an LLVM
   /// constant value, return it.  Otherwise return null.  The returned value