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Richard Smith
23339bc810
When an initializing expression is used to initialize a var parameter, we need to create the storage earlier in SemIR than the initializing expression. To do so, pass a pending block to initialization containing the var storage. Also stop using `temporary` for this purpose, since we treat temporaries as potentially-constant and immutable, but `var` parameters can be mutated by the callee. We should ideally introduce a new kind of instruction for this purpose but for now we just use `var_storage`.