Auto merge of #86255 - Smittyvb:mir-alloc-oom, r=RalfJung,oli-obk

Auto merge of #86255 - Smittyvb:mir-alloc-oom, r=RalfJung,oli-obk

Support allocation failures when interpreting MIR

This closes #79601 by handling the case where memory allocation fails during MIR interpretation, and translates that failure into an `InterpError`. The error message is "tried to allocate more memory than available to compiler" to make it clear that the memory shortage is happening at compile-time by the compiler itself, and that it is not a runtime issue.

Now that memory allocation can fail, it would be neat if Miri could simulate low-memory devices to make it easy to see how much memory a Rust program needs.

Note that this breaks Miri because it assumes that allocation can never fail.