Clear WASM linear memory on other OSes besides Linux too when using fast instance reuse

[koute]

Fixes #10095

Originally I intended to just disable fast instance reuse when the --import-memory flag is not specified when compiling the runtime, however it seems we do already always clear the linear memory anyway (only on Linux) as a side-effect of #8998 so it seems to make more sense to just make this behavior official and apply to other OSes too?

This might have a performance impact on non-Linux OSes, however:

1. There are relatively easy ways to make it faster (either use another OS-specific API if available, or just spawn a dedicated memory clearing thread to do this work in the background; on modern systems clearing memory is really fast, so it's just an issue of doing in asynchronously to reduce latency)
2. Having a core behavior like this be different between OSes may possibly invite even more weird bugs in the future (Hyrum's law and whatnot)

[pepyakin]

JFYI, for №1 for macOS there was this PR #9164

[pepyakin]

So we are officially bringing back the original memory zeroing guarantee, huh

[koute]

bot merge