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b21c438eb5
cg_llvm: Stop using `as_c_char_ptr` for coverage-related bindings
[As explained by a note in `ffi.rs`](8a1b39995e/compiler/rustc_codegen_llvm/src/llvm/ffi.rs (L4-L11)), passing strings and byte slices through FFI is more convenient if we take advantage of the fact that `*const c_uchar` and `*const c_char` have the same ABI.
Doing so avoids having to rely on a special helper function, since we can just call `as_ptr` instead.
(The same logic applies to every other binding that currently uses the `as_c_char_ptr` helper; I just haven't adjusted all of them yet.)
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As a drive-by change, this PR also marks some coverage-related FFI bindings as `safe`.