Switch recognition should not be lexical

[jakobbotsch]

runtime/src/coreclr/jit/switchrecognition.cpp

Lines 172 to 173 in 7ff684a

	// Now walk the next blocks and see if they are basically the same type of test
	for (const BasicBlock* currBb = firstBlock->Next(); currBb != nullptr; currBb = currBb->Next())

The switch recognition is currently lexical for (from what I can tell) no good reason. Instead, it seems we should be able to recognize any chain of comparisons by following the "did not equal" target.

cc @dotnet/jit-contrib @JulieLeeMSFT @EgorBo

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