Repro the UIOnOffSwitch crash for numem

[p0nce]

Probably related to mouse wheel?

[p0nce]

Example: Logic + AU + Graillon v3.2
but also reported on Linux, so very wide issue, all plugins

[p0nce]

No change with numem 1.6.2 (vs 1.6.4), no change with 1.5.1 either. Probably related to LDC?

With LDC 1.40.1, try to initialize runtime :( and crash, this should be workarounded, don't know why it happens.
With LDC 1.41.0, crash on dynamic cast. However the regression in dyncast happens with frontend DMD 1.112 not 1.111 which LDC 1.41.0 uses.

[p0nce]

Can be workarounded by not using numem for object creation/destruction. Will need to pinpoint the issue later on.

[p0nce]

Need to repro with minimal case for numem.

[p0nce]

Possibly numem vs druntime mismatch for some objects