Add std.DynamicBitSet.setAll & unsetAll

[nurpax]

Zig Version

0.14.0-dev.2384+cbc05e0b1

Steps to Reproduce and Observed Behavior

var map = std.DynamicBitSet.initEmpty(allocator, 100);
map.unsetAll(); // error

However, unsetAll and setAll functions exist but they're not exposed in the DynamicBitSet although they can be called through map.unmanaged.unsetAll/setAll.

I think it'd make sense to have wrappers for these just like there are for most other operations, like f.ex. toggleAll:

    pub fn toggleAll(self: *Self) void {
        self.unmanaged.toggleAll();
    }

Expected Behavior

var map = std.DynamicBitSet.initEmpty(allocator, 100);
map.unsetAll(); // compiles
map.setAll(); // compiles

[nurpax]

The setAll() method is actually buggy:

    const sizes = [_]usize{ 1, 63, 192, 256, 257 };
    for (sizes) |size| {
        var a = try std.DynamicBitSet.initEmpty(allocator, size);
        a.unmanaged.unsetAll();
        const cleared_count = a.count();
        a.unmanaged.setAll();
        const set_count = a.count();
        std.debug.print("{d} {d} {d}\n", .{ size, cleared_count, set_count });
    }

This prints:

1 0 64
63 0 64
192 0 192
256 0 256
257 0 320

I'd expect the first and last columns to have the same value. And looking at the setAll() implementation, it doesn't seem to handle the last padded bitset word.

[travisstaloch]

duplicate of #19933