Add large bitfield derive test and fix missing limit

Author: aeleos

src/ir/analysis/derive_copy.rs

@@ -9,6 +9,7 @@ use ir::derive::CanTriviallyDeriveCopy;
 use ir::item::IsOpaque;
 use ir::template::TemplateParameters;
 use ir::traversal::EdgeKind;
+use ir::ty::RUST_DERIVE_IN_ARRAY_LIMIT;
 use ir::ty::TypeKind;
 use std::collections::HashMap;
 use std::collections::HashSet;

tests/expectations/tests/bitfield_large_overflow.rs

@@ -0,0 +1,21 @@
+/* automatically generated by rust-bindgen */
+
+
+#![allow(dead_code, non_snake_case, non_camel_case_types, non_upper_case_globals)]
+
+
+#[repr(C)]
+pub struct _bindgen_ty_1 {
+    pub _bitfield_1: [u8; 128usize],
+    pub __bindgen_align: [u64; 0usize],
+}
+impl Default for _bindgen_ty_1 {
+    fn default() -> Self {
+        unsafe { ::std::mem::zeroed() }
+    }
+}
+extern "C" {
+    #[link_name = "a"]
+    pub static mut a: _bindgen_ty_1;
+}
+

tests/headers/bitfield_large_overflow.hpp

@@ -0,0 +1,5 @@
+// bindgen-flags: --no-layout-tests
+
+struct {
+  unsigned : 632;
+} a;