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Fixes: #79725
Some macros can create a situation where
fn_sig_spanandbody_spanmap to different files.
New documentation on coverage tests incorrectly assumed multiple test
binaries could just be listed at the end of the
llvm-covcommand,but it turns out each binary needs a
--objectprefix.This PR fixes the bug and updates the documentation to correct that
issue. It also fixes a few other minor issues in internal implementation
comments, and adds documentation on getting coverage results for doc
tests.