x86_64: fix behavior of getValue

Old behavior renamed to `getValueIfFree`.

lib/std/array_hash_map.zig

@@ -2294,8 +2294,6 @@ test "popOrNull" {
 }
 
 test "reIndex" {
-    if (@import("builtin").zig_backend == .stage2_x86_64) return error.SkipZigTest;
-
     var map = ArrayHashMap(i32, i32, AutoContext(i32), true).init(std.testing.allocator);
     defer map.deinit();