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Estimated hours taken: 3 Branches: main compiler/lookup_switch.m: Fix two bugs that caused test case failures in deep profiling grades. One bug was that an acquired register wasn't being released before the creation of a resume point, which rebuilds the code generator state (and thus forgets about acquired registers). The other bug was that is_lookup_switch wasn't performing the actions generate_goal would have when processing goals. In particular, it wasn't invoking pre_goal_update and post_goal_update on disjunctions inside the switch. compiler/lookup_util.m: Do not standardize goals by removing scopes from around other goals, because this could also remove the effects of the code generator annotations (e.g. liveness changes such as pre-births) on the scope goal. compiler/simplify.m: Eliminate those redundant scopes if asked to do so. Since this is done before the code generator annotations are put on goals, this is safe. compiler/code_gen.m: compiler/proc_gen.m: Divide the old code_gen.m into two modules: the new code_gen.m concerned with generating code for goals, and the new module proc_gen.m concerned with generating code for procedures. Without this, the code for handling goals is lost inside the old code_gen.m module. compiler/ll_backend.m: Include the new module. compiler/mercury_compile.m: Import proc_gen instead of code_gen, and ask simplify to eliminate unnecessary scopes before code generation. compiler/middle_rec.m: Update a reference to a predicate now in proc_gen.m. compiler/notes/compiler_design.html: Document the new module.