[spirv] Use LLVM graph traversal utility for PrettyBlockOrderVisitor
[spirv] Use LLVM graph traversal utility for PrettyBlockOrderVisitor

This removes a bunch of special tailored DFS code in favor of the common
LLVM utility. Besides, we avoid recursion with system stack given that
llvm::depth_first_ext is iterator based and maintains its own stack.
PiperOrigin-RevId: 277272961

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