Joe Savona 8233e8f95a All calls to lowerExpression lower to a unique temporary
This is more followup toward deleting Instruction.lvalue. The previous PR 
ensured that all Instruction.lvalue identifiers are only ever assigned to once. 
Now we ensure that `lowerExpression()` is _only_ called via 
`lowerExpressionToTemporary()`, ie we now always lower every single expression 
to a temporary. 

This will make it easier to make lvalue a part of the InstructionValue instead 
of the instruction itself, in follow-up PRs.
2023-03-03 17:09:27 -08:00
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