Add some extra friend declarations to fix a gcc-4.0 compile error.

This is a temporary fix, until more elaborate changes are ready.

llvm-svn: 109593

llvm/include/llvm/Analysis/ScalarEvolution.h

@@ -44,6 +44,7 @@ namespace llvm {
   class Loop;
   class LoopInfo;
   class Operator;
+  class SCEVUnknown;
 
   /// SCEV - This class represents an analyzed expression in the program.  These
   /// are opaque objects that the client is not allowed to do much with
@@ -175,6 +176,7 @@ namespace llvm {
 
     friend class SCEVCallbackVH;
     friend class SCEVExpander;
+    friend class SCEVUnknown;
 
     /// F - The function we are analyzing.
     ///

llvm/include/llvm/Analysis/ScalarEvolutionExpressions.h

@@ -522,6 +522,7 @@ namespace llvm {
   ///
   class SCEVUnknown : public SCEV {
     friend class ScalarEvolution;
+    friend class ScalarEvolution::SCEVCallbackVH;
 
     // This should be an AssertingVH, however SCEVUnknowns are allocated in a
     // BumpPtrAllocator so their destructors are never called.