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ZJIT: Remove write barriers on newly-allocated objects #1027

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@tekknolagi

If we inline initialize into the caller of new, we might end up with

v0 = ObjectAllocClass ...
StoreField v0, 0x0, v1
WriteBarrier v0, v1
StoreField v0, 0x0, v2
WriteBarrier v0, v2
...

We shouldn't need a write barrier until v0 escapes or something might cause a GC.

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