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Rename old upcalls and move them to rust_builtin #3922

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core::rt implements several functions that used to be upcalls. It does so by calling the old upcalls (upcall_free, malloc, fail, etc). These functions should be renamed to rust_, not upcall_ and moved to rust_builtin.cpp. Better yet, rewrite them in Rust.

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    A-runtimeArea: std's runtime and "pre-main" init for handling backtraces, unwinds, stack overflowsE-easyCall for participation: Easy difficulty. Experience needed to fix: Not much. Good first issue.

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