rustrt: Fix invalid reads caught by valgrind #14787
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This is another case of rust-lang#13246. The RAII lock wasn't being destroyed until after the allocation was free'd due to destructor scheduling. Closes rust-lang#14784
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MIR episode 5 This PR inits drop support (it is very broken at this stage, some things are dropped multiple time, drop scopes are wrong, ...) and adds stdout support (`println!` doesn't work since its expansion is dummy, but `stdout().write(b"hello world\n")` works if you use `RA_SYSROOT_HACK`) for interpreting. There is no useful unit test that it can interpret yet, but it is a good sign that it didn't hit a major road block yet. In MIR lowering, it adds support for slice pattern and anonymous const blocks, and some fixes so that we can evaluate `SmolStr::new_inline` in const eval. With these changes, 57 failed mir body remains.
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This is another case of #13246. The RAII lock wasn't being destroyed until after
the allocation was free'd due to destructor scheduling.
Closes #14784