[Vm-dev] [OpenSmalltalk/opensmalltalk-vm] Fixes for 64-bit MSVC minheadless build (#313)

[Eliot Miranda]

Hi Ben,

    ideally we'd have bit-identical FP on all platforms.  Currently this is only achievable using Andreas Raab's FloatMath plugin, used by Croquet and Terf, and not yet tested in 64-bits.  What that has to say about whether we support the default or 53-bit on x64 I don't know.  i guess we should for now simply support the default m ode.  In any case it's unlikely to make much difference because the computational model yields results being truncated to 53 bits after each operation (i.e. other than in the graphics subsystem, floating point operations are performed on double-precision floats so there's no scope for extended calculations to use 64-bit precision internally.  So feel free to include the above as commentary but I think we want to apply your pull request asap and so we should leave the precision argument for a later day when we have more data (such as a 64-bit Terf to test).

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