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[X86] Skip AMX type lowering when AMX is not used (llvm#92910)
The pass iterates over the IR multiple times, but most code doesn't use AMX. Therefore, do a single iteration in advance to check whether a function uses AMX at all, and exit early if it doesn't. This makes the function-has-AMX path slightly more expensive, but AMX users probably care a lot less about compile time than JIT users (which tend to not use AMX). For us, it reduces the time spent in this pass from 0.62% to 0.12%. Ideally, we wouldn't even need to iterate over the function to determine that it doesn't use AMX.
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