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Rollup merge of #72615 - jschwe:fix-Zprofile-documentation, r=stevekl…
…abnik Fix documentation example for gcov profiling closes #72546 Improves the documentation for the unstable Rustflag `-Zprofile` by: - stating that Incremental compilation must be turned off. - Adding the other `RUSTFLAGS` that should/need to be turned on (taken from [grcov documentation](https://github.com/mozilla/grcov#example-how-to-generate-gcda-files-for-a-rust-project)) - Mentioning `RUSTC_WRAPPER` to prevent everything getting instrumented. r? @steveklabnik
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