[PATCH] llvm-cov: Updated file checksum to be timestamp.

[Yuchen Wu]

llvm-cov: Updated file checksum to be timestamp.

Instead of permanently outputting "MVLL" as the file checksum, clang
will stamp the gcno and gcda checksums with the time of compile. This
allows for llvm-cov to check if the two gcov files are synchronized.

Regenerated the test files so they contain the timestamp. Also added
negative test to ensure error when the checksums don't match. 		 	   		  
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