Auto merge of #512 - emilio:bitfields, r=fitzgen

Rework how bitfields are handled.

This fixes #111, and unblocks stylo.

The problem with this as of right now is that it drops the accessors (though before that this code was buggy so I'm not sure it's a loss).

I can probably try to re-implement those (though it'd be more complex). WDYT @fitzgen?

Also, note that I changed the max_align_nonce because it was incorrect (we shouldn't generate padding, because `long double` was `128` bits).

Author: bors-servo

Cargo.lock

@@ -13,7 +13,7 @@ name = "bindgen"
 readme = "README.md"
 repository = "https://github.com/servo/rust-bindgen"
 documentation = "https://docs.rs/bindgen"
-version = "0.21.3"
+version = "0.22.0"
 build = "build.rs"
 
 exclude = ["tests/headers", "tests/expectations", "bindgen-integration", "ci"]

Cargo.toml

@@ -11,6 +11,7 @@ mod codegen {
         quasi_codegen::expand(&src, &dst).unwrap();
         println!("cargo:rerun-if-changed=src/codegen/mod.rs");
         println!("cargo:rerun-if-changed=src/codegen/helpers.rs");
+        println!("cargo:rerun-if-changed=src/codegen/struct_layout.rs");
     }
 }