Assertion `!ctx.ssavalue_assigned.at(ssaidx_0based)' failed.` when testing some packages

[KristofferC]

When testing the packages

"LsqFit"
"Polyhedra"
"PowerModelsRestoration"
"SinusoidalRegressions"
"EasyFit

with an assert build they error with:

julia: /source/src/codegen.cpp:5042: void emit_ssaval_assign(jl_codectx_t&, ssize_t, jl_value_t*): Assertion `!ctx.ssavalue_assigned.at(ssaidx_0based)' failed.

Example PkgEval log: https://s3.amazonaws.com/julialang-reports/nanosoldier/pkgeval/by_hash/c9a32f4_vs_e4ee485/LsqFit.primary.log

[maleadt]

That's the same as #50379 (well, a different error but AFAICT it's due to the same issue).