[PATCH] Use map instead of vector to store line counts in llvm-cov

[Yuchen Wu]

Use a map instead of vector to store line counts.




There are a few motivations for this:

Using a map allows for checking if line is in map. This differentiates unexecutable lines (such as comments) from unexecuted logical lines of code. "#####" is now outputted in this case, as it is done in gcov.Source files are no longer read in twice: once when storing the line counts, and once when outputting the data.Greatly simplifies the function FileInfo::addLineCount().

 		 	   		  
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