[PATCH] Format llvm-cov output to be more like gcov

[Yuchen Wu]

This patch continues to modify llvm-cov's output to match gcov. Specifically, this changes the output formatting of llvm-cov. 
It does so by adjusting the whitespace padding, outputting the GCNO and GCDA filenames, and stripping the excess '\0's from strings. 		 	   		  
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