BE-258: HashQL: Add Changed enum to track MIR transformation pass modifications#8210

indietyp wants to merge 3 commits intobm/be-255-hashql-add-copy-propagation-passhashintel/hash:bm/be-255-hashql-add-copy-propagation-passfrom

bm/be-258-hashql-implement-transformationpass-changed-detectionhashintel/hash:bm/be-258-hashql-implement-transformationpass-changed-detectionCopy head branch name to clipboard