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cmd/gc: get rid of redundant slice bound check.
For normal slices a[i:j] we're generating 3 bounds checks: j<={len(string),cap(slice)}, j<=j (!), and i<=j. Somehow snuck in as part of the [i:j:k] implementation where the second check does something. Remove the second check when we don't need it. R=rsc, r CC=golang-dev https://golang.org/cl/12311046
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@ -2623,7 +2623,7 @@ sliceany(Node* n, NodeList **init)
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cb = n->right->right->right;
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} else {
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hb = n->right->right;
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cb = hb;
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cb = N;
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}
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bounded = n->etype;
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