Bug 18377 – -cov LOC is inadequate for 1 liner branching; need a metric based on branching

`dmd -cov -run main.d` shows 100% coverage; this is misleading since a branch is not taken: ``` void main(){ int a; if(false) a+=10; } ``` how about adding a `-covmode=[loc|branch]` that would allow either reporting LOC coverage or branch coverage? branch coverage would report number of branches taken at least once / total number of branches. It would not only address the above issue, but it is IMO a much better metric for coverage, less sensitive to 'overcounting' of large blocks in main code branches (size of code block in a branch is irrelevant as far as testing is concerned); eg: ``` int fun(int x){ if(x<0) return fun2(); // accounts for 1 LOC and 1 branch // long block of non-branching code here... // accounts for 10 LOC and 1 branch } ``` NOTE: branches would include anything that allows more than 1 code path (eg: switch, if)

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