Revert "stage2 parser: elide memcpy of large initialization lists"

This reverts commit 84df1d4f3d0312553f5a3857ed67042319c20846.

Not worth the complexity! Always memcpy initialization lists into the
arena.
688aa114e4Andrew Kelley committed on 5/21/2020, 2:42:43 AMparent84df1d4
2 files changedLine totals unavailable