Nate Chandler 896a464ced [AllocBoxToStack] Lexical borrowees get lexical alloc_stacks. ...

Previously, whenever an alloc_box that was promoted to an alloc_stack,
the new alloc_stack would be lexical.  The result was that alloc_boxes
which didn't need (or explicitly didn't want, in the case of eager move
vars) received lexical alloc_stacks.

Here, only add the lexical flag to the new alloc_stack instruction if
any of the box's uses are `begin_borrow [lexical]`.  That way,
alloc_boxes end up having lexical alloc_stacks only if they were
"lexical alloc_boxes".

2022-08-12 11:37:19 -07:00

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