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spot a counter-drift outlier
pc_nums allocated three ctree_item_t SWIG objects per candidate column -- the
third instance of the same fault already fixed in decomp_map and found in
decompile_function_safe. 1247 -> 614ms warm over 18991 lines of bash, identical
literal counts, 0 mismatches over echo's 128 functions.
Both it and the fast decompile_function_safe are parked rather than applied:
together they are worth ~350ms against a run-to-run spread of ~500ms on this
box (means 25045 with, 25140 without over seven runs), so the benchmark cannot
resolve them. Neither adds complexity -- both remove allocations -- so they are
kept on disk with their measurements for a per-operation-latency goal.
Also records the 27283ms outlier: the work counters moved with it, which is how
an outlier is told from a regression.
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