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Support --undefined, -u argument #528

@mati865

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@mati865

Trying to obtain code coverage using cargo-llvm-cov fails when using wild as the linker because unsupported -u __llvm_profile_runtime is passed to the linker.

Merely ignoring them is not sufficient because the coverage is not created without it: warning: not found *.profraw files in /home/mateusz/Projects/wild/target/llvm-cov-target; this may occur if target directory is accidentally cleared, or running report subcommand without running any tests or binaries.

.cargo/config.toml change to use wild is sufficient to reproduce the problem.

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