[PATCH] llvm-cov: Edges now store pointers to blocks.

[Yuchen Wu]

llvm-cov: Edges now store pointers to blocks.

Changed GCOVBlocks so that the Edges vector stores pointers to other
GCOVBlocks rather than just the block number. Storing the block number
was only useful for knowing the number of edges and for debug info.
Storing pointers is useful for traversing the edges, which will be
needed to implement branch probabilities (-b option). 		 	   		  
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