Merge pull request #3675 from Vexu/atomic-store

Add @atomicStore builtin

test/compile_errors.zig

@@ -2,6 +2,16 @@ const tests = @import("tests.zig");
 const builtin = @import("builtin");
 
 pub fn addCases(cases: *tests.CompileErrorContext) void {
+    cases.add(
+        "atomic orderings of atomicStore Acquire or AcqRel",
+        \\export fn entry() void {
+        \\    var x: u32 = 0;
+        \\    @atomicStore(u32, &x, 1, .Acquire);
+        \\}
+    ,
+        "tmp.zig:3:30: error: @atomicStore atomic ordering must not be Acquire or AcqRel",
+    );
+
     cases.add(
         "missing const in slice with nested array type",
         \\const Geo3DTex2D = struct { vertices: [][2]f32 };