[Issue 15504] core.demangle uses exception handling for normal control flow

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=15504

feklushkin.denis at gmail.com changed:

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                 CC|                            |feklushkin.denis at gmail.com

--- Comment #2 from feklushkin.denis at gmail.com ---
Also demangle consumes megabytes of memory for each unsucessful demangle. This
causes demangling unittests fails on low-memory system.

Little related discussion here: https://github.com/dlang/druntime/pull/3262

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