blockAddrConstAssumeCapacity

fn blockAddrConstAssumeCapacity(
    self: *Builder,
    function: Function.Index,
    block: Function.Block.Index,
) Constant {
    const Adapter = struct {
        builder: *const Builder,
        pub fn hash(_: @This(), key: Constant.BlockAddress) u32 {
            return @truncate(std.hash.Wyhash.hash(
                comptime std.hash.int(@backingInt(Constant.Tag.blockaddress)),
                std.mem.asBytes(&key),
            ));
        }
        pub fn eql(ctx: @This(), lhs_key: Constant.BlockAddress, _: void, rhs_index: usize) bool {
            if (ctx.builder.constant_items.items(.tag)[rhs_index] != .blockaddress) return false;
            const rhs_data = ctx.builder.constant_items.items(.data)[rhs_index];
            const rhs_extra = ctx.builder.constantExtraData(Constant.BlockAddress, rhs_data);
            return std.meta.eql(lhs_key, rhs_extra);
        }
    };
    const data = Constant.BlockAddress{ .function = function, .block = block };
    const gop = self.constant_map.getOrPutAssumeCapacityAdapted(data, Adapter{ .builder = self });
    if (!gop.found_existing) {
        gop.key_ptr.* = {};
        gop.value_ptr.* = {};
        self.constant_items.appendAssumeCapacity(.{
            .tag = .blockaddress,
            .data = self.addConstantExtraAssumeCapacity(data),
        });
    }
    return @fromBackingInt(@intCast(gop.index));
}