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7f41e20802
There is a mechanism to avoid redundant `as` ZIR instructions which is to pass `ResultLoc.coerced_ty` instead of `ResultLoc.ty` when it is known by AstGen that Sema will do the coercion. This commit downgrades `coerced_ty` to `ty` when a result location passes through an expression that branches, such as `if`, `switch`, `while`, and `for`, causing the `as` ZIR instruction to be emitted. This ensures that the type of a result location will be applied to, e.g. a `comptime_int` on either side of a branch on a runtime condition.