Change llvm-cov output formatting to be more similar to gcov.

- Replaced tabs with proper padding
- print() takes two arguments, which are the GCNO and GCDA filenames
- Files are listed at the top of output, appended by line 0
- Stripped strings of trailing \0s
- Removed last two lines of whitespace in output

Patch by Yuchen Wu!

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@193148 91177308-0d34-0410-b5e6-96231b3b80d8

tools/llvm-cov/llvm-cov.cpp

@@ -74,6 +74,6 @@ int main(int argc, char **argv) {
 
   FileInfo FI;
   GF.collectLineCounts(FI);
-  FI.print();
+  FI.print(InputGCNO, InputGCDA);
   return 0;
 }