Add peephole optimizer for newarray(X)/expandarray(X, 0) -> opt_reverse(X)

This renames the reverse instruction to opt_reverse, since now it
is only added by the optimizer.  Then it uses as a more general
form of swap.  This optimizes multiple assignment in the popped
case with more than two elements.

1 files changed, 1 insertions, 1 deletions

diff --git a/insns.def b/insns.def
index ebdbed6237..15c4734b8b 100644
--- a/insns.def
+++ b/insns.def
@@ -599,7 +599,7 @@ swap
 
 /* reverse stack top N order. */
 DEFINE_INSN
-reverse
+opt_reverse
 (rb_num_t n)
 (...)
 (...)