cc7a9d6972
Read from non-scalar constants and statics in dataflow const-prop DataflowConstProp is designed to handle scalar values. When MIR features an assignment from a non-scalar constant, we need to manually decompose it into the custom state space. This PR tweaks interpreter callbacks to allow reusing `eval_mir_constant` without having a stack frame to get a span from. r? `@oli-obk` cc `@jachris`