std.sync.atomic: extended atomic helper functions (#8866)

- deprecates `std.Thread.spinLoopHint` and moves it to `std.atomic.spinLoopHint`
- added an Atomic(T) generic wrapper type which replaces atomic.Bool and atomic.Int
- in Atomic(T), selectively expose member functions depending on T and include bitwise atomic methods when T is an Integer
- added fence() and compilerFence() to std.atomic

src/BuiltinFn.zig

@@ -400,7 +400,7 @@ pub const list = list: {
             "@fence",
             .{
                 .tag = .fence,
-                .param_count = 0,
+                .param_count = 1,
             },
         },
         .{