Reorder hir::Expr fields.

nnethercote · nnethercote · commit 9366ba31668a · 2016-11-04T15:00:28.000+11:00
On 64-bit platforms this reduces the size of `Expr` from 96 bytes to 88
bytes.
diff --git a/src/librustc/hir/mod.rs b/src/librustc/hir/mod.rs
@@ -840,8 +840,8 @@ pub enum UnsafeSource {
 #[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash)]
 pub struct Expr {
     pub id: NodeId,
-    pub node: Expr_,
     pub span: Span,
+    pub node: Expr_,
     pub attrs: ThinVec<Attribute>,
 }
 

Original file line number	Diff line number	Diff line change
`@@ -840,8 +840,8 @@ pub enum UnsafeSource {`
`840`	`840`	`#[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash)]`
`841`	`841`	`pub struct Expr {`
`842`	`842`	`pub id: NodeId,`
`843`		`- pub node: Expr_,`
`844`	`843`	`pub span: Span,`
	`844`	`+ pub node: Expr_,`
`845`	`845`	`pub attrs: ThinVec<Attribute>,`
`846`	`846`	`}`
`847`	`847`