ZJIT: Optimize NewArray to use rb_ec_ary_new_from_values #899
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Fixes #829
Supersedes #896
Instead of calling
rb_ary_new_capaandrb_ary_pushfor each element (N+1 C function calls), this usesgen_push_opndsand callsrb_ec_ary_new_from_valuesonce (with a leaf call), which matches what the interpreter and YJIT do.