Bug 1985509 - Update bindgen to fix overaligned types on x86. r=nika,supply-chain-reviewers,profiler-reviewers,canaltinova

Bindgen historically represented 8-byte aligned types with u64. That's
borked in x86 where u64 is 4-byte aligned.

I fixed this in upstream bindgen
(rust-lang/rust-bindgen#3280), so update it.

There are a few changes needed:

 * mozilla/neqo#2913 to deal with the now
   properly aligned type.

 * Similar change (less fun because transmute, but still sound) in the
   macos crash reporter. I could try to generate a bit easier to use
   bindings for 8-byte 8-byte-aligned blobs, but this would do.

 * Some opaque additions in layout/style/ServoBindings.toml and the
   profiler bindings. This is unrelated to the opaque change, but
   fallout from other bindgen improvements. In particular, layout tests
   now run at compile time, so this uncovered some layout mismatches on
   platforms where we don't run rusttests on CI.

Differential Revision: https://phabricator.services.mozilla.com/D262840

Author: emilio

style/gecko/snapshot_helpers.rs

@@ -58,7 +58,7 @@ unsafe fn get_class_or_part_from_attr(attr: &structs::nsAttrValue) -> Class {
             .mAtomArray
             .as_ref();
         let array =
-            (*attr_array).mArray.as_ptr() as *const structs::nsTArray<structs::RefPtr<nsAtom>>;
+            (*attr_array).mArray.0.as_ptr() as *const structs::nsTArray<structs::RefPtr<nsAtom>>;
         return Class::More(&**array);
     }
     debug_assert_eq!(base_type, structs::nsAttrValue_ValueBaseType_eStringBase);