Auto merge of #60986 - Centril:rollup-nhpgrfb, r=Centril

Rollup of 11 pull requests

Successful merges:

 - #60383 (Fix position source code files toggle)
 - #60453 (Fall back to `/dev/urandom` on `EPERM` for `getrandom`)
 - #60487 (Fix search sidebar width when no crate select is present)
 - #60511 (Fix intra-doc link resolution failure on re-exporting libstd)
 - #60823 (Fix incremental compilation of cdylib emitting spurious unused_attributes lint)
 - #60915 (stable hashing: Remove unused field and add documentation.)
 - #60942 (Misc changes to rustc_metadata)
 - #60952 (Document BinaryHeap time complexity)
 - #60959 (rustc: Improve type size assertions)
 - #60972 (remove confusing remarks about mixed volatile and non-volatile accesses)
 - #60983 (Set -funwind-tables and -fno-exceptions unconditionally for LLVM's libunwind)

Failed merges:

r? @ghost

4 files changed, 8 insertions, 8 deletions

diff --git a/src/libsyntax/ast.rs b/src/libsyntax/ast.rs
index d12240655e6..b55ca453fb3 100644
--- a/src/libsyntax/ast.rs
+++ b/src/libsyntax/ast.rs
@@ -16,7 +16,7 @@ use crate::ThinVec;
 
 use rustc_data_structures::indexed_vec::Idx;
 #[cfg(target_arch = "x86_64")]
-use rustc_data_structures::static_assert;
+use rustc_data_structures::static_assert_size;
 use rustc_target::spec::abi::Abi;
 use syntax_pos::{Span, DUMMY_SP};
 
@@ -964,7 +964,7 @@ pub struct Expr {
 
 // `Expr` is used a lot. Make sure it doesn't unintentionally get bigger.
 #[cfg(target_arch = "x86_64")]
-static_assert!(MEM_SIZE_OF_EXPR: std::mem::size_of::<Expr>() == 96);
+static_assert_size!(Expr, 96);
 
 impl Expr {
     /// Whether this expression would be valid somewhere that expects a value; for example, an `if`
diff --git a/src/libsyntax/feature_gate.rs b/src/libsyntax/feature_gate.rs
index 8a066f3f4a0..5b1a9bb739f 100644
--- a/src/libsyntax/feature_gate.rs
+++ b/src/libsyntax/feature_gate.rs
@@ -998,7 +998,7 @@ pub const BUILTIN_ATTRIBUTES: &[BuiltinAttribute] = &[
     (sym::repr, Normal, template!(List: "C, packed, ..."), Ungated),
     (sym::path, Normal, template!(NameValueStr: "file"), Ungated),
     (sym::automatically_derived, Normal, template!(Word), Ungated),
-    (sym::no_mangle, Normal, template!(Word), Ungated),
+    (sym::no_mangle, Whitelisted, template!(Word), Ungated),
     (sym::no_link, Normal, template!(Word), Ungated),
     (sym::derive, Normal, template!(List: "Trait1, Trait2, ..."), Ungated),
     (
diff --git a/src/libsyntax/parse/token.rs b/src/libsyntax/parse/token.rs
index 049fb6cb78b..068fc41c87a 100644
--- a/src/libsyntax/parse/token.rs
+++ b/src/libsyntax/parse/token.rs
@@ -19,7 +19,7 @@ use log::info;
 use std::fmt;
 use std::mem;
 #[cfg(target_arch = "x86_64")]
-use rustc_data_structures::static_assert;
+use rustc_data_structures::static_assert_size;
 use rustc_data_structures::sync::Lrc;
 
 #[derive(Clone, PartialEq, RustcEncodable, RustcDecodable, Hash, Debug, Copy)]
@@ -74,7 +74,7 @@ pub enum Lit {
 }
 
 #[cfg(target_arch = "x86_64")]
-static_assert!(MEM_SIZE_OF_LIT: mem::size_of::<Lit>() == 8);
+static_assert_size!(Lit, 8);
 
 impl Lit {
     crate fn literal_name(&self) -> &'static str {
@@ -220,7 +220,7 @@ pub enum Token {
 
 // `Token` is used a lot. Make sure it doesn't unintentionally get bigger.
 #[cfg(target_arch = "x86_64")]
-static_assert!(MEM_SIZE_OF_STATEMENT: mem::size_of::<Token>() == 16);
+static_assert_size!(Token, 16);
 
 impl Token {
     /// Recovers a `Token` from an `ast::Ident`. This creates a raw identifier if necessary.
diff --git a/src/libsyntax/tokenstream.rs b/src/libsyntax/tokenstream.rs
index 93b5ecadd14..3cb16c30a50 100644
--- a/src/libsyntax/tokenstream.rs
+++ b/src/libsyntax/tokenstream.rs
@@ -21,7 +21,7 @@ use crate::print::pprust;
 
 use syntax_pos::{BytePos, Mark, Span, DUMMY_SP};
 #[cfg(target_arch = "x86_64")]
-use rustc_data_structures::static_assert;
+use rustc_data_structures::static_assert_size;
 use rustc_data_structures::sync::Lrc;
 use serialize::{Decoder, Decodable, Encoder, Encodable};
 use smallvec::{SmallVec, smallvec};
@@ -158,7 +158,7 @@ pub type TreeAndJoint = (TokenTree, IsJoint);
 
 // `TokenStream` is used a lot. Make sure it doesn't unintentionally get bigger.
 #[cfg(target_arch = "x86_64")]
-static_assert!(MEM_SIZE_OF_TOKEN_STREAM: mem::size_of::<TokenStream>() == 8);
+static_assert_size!(TokenStream, 8);
 
 #[derive(Clone, Copy, Debug, PartialEq)]
 pub enum IsJoint {