cmd/compile: optimize small runtime.memequal calls #37275
In the SSA backend, we could optimize a call to runtime.memequal in which the length is small and one argument points to a readonly data symbol. We could replace it by reading the readonly data and checking the bytes of the other argument directly.
This is similar to the optimization in walk.go for comparing against a constant string, and could potentially supercede it. The optimization in walk.go doesn't always trigger. An example is using strings.HasPrefix to check for a constant prefix; the call gets inlined, but walk.go isn't able to do the optimization because its analysis isn't powerful enough.
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