[PATCH] llvm-cov: Support for big-endianness

[Yuchen Wu]

I split this up into two parts. The first part contains patches for llvm and compiler-rt and it changes the gcno and gcda format to be consistently written as ints whenever possible instead of a combination of ints and char arrays.

The second part is the support for different endiannesses. This will hopefully make it easier to see what is actually needed for byte-swapping. 		 	   		  
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