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97d7fddfb7
Introduce `ResultLoc.none_or_ref` which is used by field access expressions to avoid unnecessary loads when the field access itself will do the load. This turns: ```zig p.y - p.x - p.x ``` from ```zir %14 = load(%4) node_offset:8:12 %15 = field_val(%14, "y") node_offset:8:13 %16 = load(%4) node_offset:8:18 %17 = field_val(%16, "x") node_offset:8:19 %18 = sub(%15, %17) node_offset:8:16 %19 = load(%4) node_offset:8:24 %20 = field_val(%19, "x") node_offset:8:25 ``` to ```zir %14 = field_val(%4, "y") node_offset:8:13 %15 = field_val(%4, "x") node_offset:8:19 %16 = sub(%14, %15) node_offset:8:16 %17 = field_val(%4, "x") node_offset:8:25 ``` Much more compact. This requires `Sema.zirFieldVal` to support both pointers and non-pointers. C backend: Implement typedefs for struct types, as well as the following TZIR instructions: * mul * mulwrap * addwrap * subwrap * ref * struct_field_ptr Note that add, addwrap, sub, subwrap, mul, mulwrap instructions are all incorrect currently and need to be updated to properly handle wrapping and non wrapping for signed and unsigned. C backend: change indentation delta to 1, to make the output smaller and to process fewer bytes. I promise I will add a test case as soon as I fix those warnings that are being printed for my test case.