strings: fix performance of nextind #51671
Merged
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The recursion (for invalid bytes) was preventing inlining, as was the length of the function. For ASCII data, the cost of the call far exceeds the cost of decoding the data.
This was harmed by Keno's PR #50805, since we now miscompute the inlining cost of the error branch, though I don't think it worked before either as we still mis-estimated the cost of jl_string_ptr as 20 instead of 1.
Closes #51624
@nanosoldier
runbenchmarks("string" || "strings" || "io", vs=":master")