std.HashMap: make ensureCapacity optimize for the expected count, add ensureCapacityExact
std.HashMap: make ensureCapacity optimize for the expected count, add ensureCapacityExact

andrewrk/zig,zig-lang/zig,raulgrell/zig,zig-lang/zig,raulgrell/zig,zig-lang/zig,raulgrell/zig,raulgrell/zig,andrewrk/zig,raulgrell/zig