Use a negative value to represent INVALID_SIMPLE_VALUE_TYPE instead of 256....
Use a negative value to represent INVALID_SIMPLE_VALUE_TYPE instead of 256. Its much cheaper for the isSimple() checks to look for values less than 0 rather than a value greater than 255. This shaves ~8k off the size of the llc binary on x86-64. llvm-svn: 170981
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