[Prepacker] Moved the Prepacker Out of Try Pack #2962
Merged
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The AP flow makes its own prepacker which it uses throughout. However, a full legalizer in the AP flow (APPack) uses the try_pack method which creates its own prepacker. This creates two independent prepacker objects when only one is needed.
Move the construction of the prepacker object into vpr_api and have it get passed into the try_pack function.
Resolves #2950