Change more x64 size checks to not apply to x32.

Commit 95e096d6 changed a bunch of size checks already, but more have
been added, so this fixes the new ones the same way: the various size
checks that are conditional on target_arch = "x86_64" were not intended
to apply to x86_64-unknown-linux-gnux32, so add
target_pointer_width = "64" to the conditions.

compiler/rustc_parse/src/parser/attr_wrapper.rs

@@ -34,7 +34,7 @@ pub struct AttrWrapper {
 
 // This struct is passed around very frequently,
 // so make sure it doesn't accidentally get larger
-#[cfg(target_arch = "x86_64")]
+#[cfg(all(target_arch = "x86_64", target_pointer_width = "64"))]
 rustc_data_structures::static_assert_size!(AttrWrapper, 16);
 
 impl AttrWrapper {