25d3713b07
This change adds to Liveness a simple pattern match for the try-like `.condbr` blocks emitted by Sema's safety checks. This allows us to determine that these do not modify memory, which permits us to elide additional loads in the backend. As @Vexu points out in the main issue, this is probably not a complete solution on its own. We'll still want a way to reliably narrow the load/copy when performing several consecutive accesses, such as `foo.arr[x][y].z` Resolves https://github.com/ziglang/zig/issues/12215
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