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Tests added in cast-target-abi.rs, covering the single element, array, and prefix cases in `CastTarget::llvm_type`, and the Rust-is-larger/smaller cases in the Rust<->ABI copying code. ffi-out-of-bounds-loads.rs was overhauled to be runnable on any platform. Its alignment also increases due to the removal of a `min` in the previous commit; this was probably an insufficient workaround for this issue or similar. The higher alignment is fine, since the alloca is actually aligned to 8 bytes, as the test checks now confirm.