inference: regression in `BaseBenchmarks.InferenceBenchmarks.many_local_vars` benchmark from #46010

[aviatesk]

#46010 seems to have introduced a significant regression in cases like BaseBenchmarks.InferenceBenchmarks.many_local_vars.

There are some observation and discussion happening here:

• benchmark result: dd375e1#commitcomment-82877581
• profiling: dd375e1#commitcomment-83236324