[PATCH] llvm-cov: Split GCOVFile's read into GCNO and GCDA.

[Yuchen Wu]

llvm-cov: Split GCOVFile's read into GCNO and GCDA.

This splits the file-scope read() function into readGCNO() and 
readGCDA(). Also broke file format read into functions that first read
the file type, then check the version. 		 	   		  
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