Segfault in ExpressionUse::setUse(Expression*)

[surovic]

When trying to generate pseudocode from a clang compiled IR module (with --module-in and -nooptimize) the AST generation pass in the backend dies due to, what I assume to be, an illegal write on expression->firstUse = this; in fcd/ast/expression_use.cpp.

The crash was produced using the following module.
miniz.zip