riscv64: cargo testsuite: uplift_dwp_of_bin_on_linux fails (foo.dwp missing)

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Detected by our CI system, when running ./x test --stage 2 src/tools/cargo will get

...
running 1 tests
running `/home/vimer/rust/rust/build/riscv64gc-unknown-linux-gnu/stage2-tools/riscv64gc-unknown-linux-gnu/release/cargo build --bins --examples --tests`

thread 'build::uplift_dwp_of_bin_on_linux' (4024400) panicked at src/tools/cargo/tests/testsuite/build.rs:5258:5:
assertion failed: p.target_debug_dir().join("foo.dwp").is_file()
stack backtrace:
   0: __rustc::rust_begin_unwind
   1: core::panicking::panic_fmt
   2: core::panicking::panic
   3: testsuite::build::uplift_dwp_of_bin_on_linux
   4: <testsuite::build::uplift_dwp_of_bin_on_linux::{closure#0} as core::ops::function::FnOnce<()>>::call_once
note: Some details are omitted, run with `RUST_BACKTRACE=full` for a verbose backtrace.

build::uplift_dwp_of_bin_on_linux ... F


failures:


failures:
    build::uplift_dwp_of_bin_on_linux

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rustc --version --verbose:

rustc 1.98.0-dev

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