[Issue 19550] [REG 2.078] Massive compiler backend slowdown

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=19550

--- Comment #7 from safety0ff.bugz <safety0ff.bugz at gmail.com> ---
Created attachment 1781
  --> https://issues.dlang.org/attachment.cgi?id=1781&action=edit
preliminary patch

Attached a preliminary patch.
It doesn't help the other related bugzilla issues, but takes the test case from
this issue from 1m5.368s -> 0m0.603s.

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