Add drop_tracking_mir option.

Author: cjgillot

compiler/rustc_session/src/options.rs

@@ -1290,6 +1290,8 @@ options! {
         (default: no)"),
     drop_tracking: bool = (false, parse_bool, [TRACKED],
         "enables drop tracking in generators (default: no)"),
+    drop_tracking_mir: bool = (false, parse_bool, [TRACKED],
+        "enables drop tracking on MIR in generators (default: no)"),
     dual_proc_macros: bool = (false, parse_bool, [TRACKED],
         "load proc macros for both target and host, but only link to the target (default: no)"),
     dump_dep_graph: bool = (false, parse_bool, [UNTRACKED],

tests/rustdoc-ui/z-help.stdout

@@ -20,6 +20,7 @@
     -Z                                 dlltool=val -- import library generation tool (windows-gnu only)
     -Z                 dont-buffer-diagnostics=val -- emit diagnostics rather than buffering (breaks NLL error downgrading, sorting) (default: no)
     -Z                           drop-tracking=val -- enables drop tracking in generators (default: no)
+    -Z                       drop-tracking-mir=val -- enables drop tracking on MIR in generators (default: no)
     -Z                        dual-proc-macros=val -- load proc macros for both target and host, but only link to the target (default: no)
     -Z                          dump-dep-graph=val -- dump the dependency graph to $RUST_DEP_GRAPH (default: /tmp/dep_graph.gv) (default: no)
     -Z                  dump-drop-tracking-cfg=val -- dump drop-tracking control-flow graph as a `.dot` file (default: no)