implement PR7569, warning about assignment to null, which 
people seem to write when they want a deterministic trap.
Suggest instead that they use a volatile pointer or 
__builtin_trap.



git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@107756 91177308-0d34-0410-b5e6-96231b3b80d8
4 files changed