Scott Michel 0da772db1c Check for NULL before traversing the isa<> type hierarchy checking with a
NULL-based reference.

Note: Encountered this a few times on Tiger + gcc 4.0.1. Might just be a
platform-specific compiler issue, but it's good defensive programming in any
case.

llvm-svn: 59890
2008-11-22 23:49:26 +00:00
..