[gcov] Add -i --intermediate-format
Between gcov 4.9~8, `gcov -i $file` prints coverage information to $file.gcov in an intermediate text format (single file, instead of $source.gcov for each source file). lcov newer than 2019-05-24 detects -i support and uses it to increase processing speed. gcov 9 (GCC r265587) removed --intermediate-format and -i was changed to mean --json-format. However, we consider this format still useful and support it. geninfo (part of lcov) supports this format even if we announce that we are compatible with gcov 9.0.0
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