Sema: fix condition for non-pointer noalias error

Closes #13987

test/cases/compile_errors/noalias_on_non_pointer_param.zig

@@ -1,6 +1,12 @@
 fn f(noalias x: i32) void { _ = x; }
 export fn entry() void { f(1234); }
 
+fn generic(comptime T: type, noalias _: [*]T, noalias _: [*]const T, _: usize) void  {}
+comptime { _ = generic; }
+
+fn slice(noalias _: []u8) void  {}
+comptime { _ = slice; }
+
 // error
 // backend=stage2
 // target=native