enable passing behavior test

This was disabled for macOS but I just tested it on my M1 and it works
fine.

test/behavior/eval.zig

@@ -425,7 +425,6 @@ test "f64 at compile time is lossy" {
 }
 
 test {
-    if (builtin.zig_backend != .stage1 and builtin.os.tag == .macos) return error.SkipZigTest;
     comptime try expect(@as(f128, 1 << 113) == 10384593717069655257060992658440192);
 }