[Vm-dev] [OpenSmalltalk/opensmalltalk-vm] Patch callback thunkEntry to not optimize (#353)

[Marcel Taeumel]

qsort still SEGFAULTs for me when compiled via Cygwin with `gcc-Version 10.2.0 (GCC)` in production mode (`./mvm -f`). :-( 

When trying to qsort a list of 10 floats, the first callback is fine but the second callback has a different address for the callback context -- which should not happen -- and shows bogus values for the stack arguments. Maybe it is related to some sort of stack optimization?

Works fine with DEBUG build, does also SEGFAULT with ASSERT build.

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