[PATCH] llvm-cov: Slightly improved error checking.

[Yuchen Wu]

llvm-cov: Slightly improved error checking.

- readInt() should check all 4 bytes can be read, not just 1.
- In the event of false data in the gcno file, it was possible to index
  into a non-existent index of SmallVector, causing assertion error. 		 	   		  
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