https://gcc.gnu.org/bugzilla/show_bug.cgi?id=116003
--- Comment #1 from Andrew Macleod <amacleod at redhat dot com> --- When registering an equivalence, the oracle creates an initial equivalence for an SSA_NAME with itself in the def block. This prevents dominator queries from searching past the definition block. In this case the definition stmt has no gimple_bb set yet, so it is ice-ing If the definition stmt for the SSA_NAME has not been placed in the CFG yet, we should defer creating this record until it has. The next time an equivalence is registered, if the SSA_NAME is in the IL then this record will be created. Patch in testing
