xd009642 / tarpaulin / #749

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Fix false-negative on `loop` keyword line in force-covered fns (#1842)

Force-covered fns (generic, `#[inline]`, generic impl methods) reported
the `loop` keyword line as uncovered:

    pub fn f<T>() {
        loop {       // <-- uncovered
            if cond {
                return;
            }
        }
    }

LLVM does not consistently anchor a coverage region to the `loop`
keyword line, so force-cover flags it as a miss. Ignore the line when
the enclosing fn is force-covered, unless the body's first statement
sits on the same row (as in `loop { return; }`).

10 of 10 new or added lines in 1 file covered. (100.0%)

4909 of 5724 relevant lines covered (85.76%)

250966.32 hits per line