Convert 'struct' to 'class' in various places to adhere to the coding standards
and work better with VC++.  Patch contributed by Morten Ofstad!

llvm-svn: 17281
diff --git a/llvm/lib/Transforms/Scalar/SCCP.cpp b/llvm/lib/Transforms/Scalar/SCCP.cpp
index aa57159..82d00b4 100644
--- a/llvm/lib/Transforms/Scalar/SCCP.cpp
+++ b/llvm/lib/Transforms/Scalar/SCCP.cpp
@@ -135,7 +135,7 @@
   // The implementation of this class
   //
 private:
-  friend class InstVisitor<SCCP>;        // Allow callbacks from visitor
+  friend struct InstVisitor<SCCP>;        // Allow callbacks from visitor
 
   // markConstant - Make a value be marked as "constant".  If the value
   // is not already a constant, add it to the instruction work list so that