[llvm] [llvm-cov] Export decision coverage to output json (PR #144335)

[Alan Phipps via llvm-commits]

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@@ -108,10 +108,22 @@ json::Array gatherConditions(const coverage::MCDCRecord &Record) {
   return Conditions;
 }
 
+std::pair<unsigned, unsigned> getDecisions(const coverage::MCDCRecord &Record) {
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evodius96 wrote:

As a design consideration, I'm reluctant to bring knowledge of test vectors into the Exporter and would favor encapsulating the calculation of the number of True and False test vectors within `coverage::MCDCRecord`.  Basically, move getDecisions() into `coverage::MCDCRecord`. That routine can still return a pair of numbers.

https://github.com/llvm/llvm-project/pull/144335