[wasm coreclr] move stack in debug builds to not start at 0 address

[radekdoulik]

We can use '-sGLOBAL_BASE=...' option to force the stack not start at 0 address in debug builds.

It currently breaks other things, so it needs more work. I would also like to look at it in more detail to be sure we indeed want to use this option. Mono doesn't currently use it.

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[kg]

Previously the default global base in emscripten wasn't 0, so if we rely on it being zero we should be explicit about whatever base we currently need, IMO