implement rustc_force_inline parser

compiler/rustc_attr_data_structures/src/attributes.rs

@@ -235,7 +235,8 @@ pub enum AttributeKind {
 
     /// Represents [`#[repr]`](https://doc.rust-lang.org/stable/reference/type-layout.html#representations).
     Repr(ThinVec<(ReprAttr, Span)>),
-
+    /// Represents `#[rustc_force_inline]`
+    RustcForceInline(Span, Option<Symbol>),
     /// Represents `#[stable]`, `#[unstable]` and `#[rustc_allowed_through_unstable_modules]`.
     Stability {
         stability: Stability,

compiler/rustc_attr_parsing/src/attributes/inline.rs

@@ -11,6 +11,7 @@ use super::{AcceptContext, AttributeOrder, OnDuplicate};
 use crate::attributes::SingleAttributeParser;
 use crate::context::Stage;
 use crate::parser::ArgParser;
+use crate::session_diagnostics::IncorrectMetaItem;
 
 pub(crate) struct InlineParser;
 

compiler/rustc_attr_parsing/src/context.rs

@@ -18,7 +18,7 @@ use rustc_span::{DUMMY_SP, ErrorGuaranteed, Span, Symbol, sym};
 use crate::attributes::allow_unstable::{AllowConstFnUnstableParser, AllowInternalUnstableParser};
 use crate::attributes::confusables::ConfusablesParser;
 use crate::attributes::deprecation::DeprecationParser;
-use crate::attributes::inline::InlineParser;
+use crate::attributes::inline::{InlineParser, RustcForceInlineParser};
 use crate::attributes::lint_helpers::AsPtrParser;
 use crate::attributes::repr::ReprParser;
 use crate::attributes::stability::{
@@ -108,6 +108,7 @@ attribute_parsers!(
         Single<ConstStabilityIndirectParser>,
         Single<DeprecationParser>,
         Single<InlineParser>,
+        Single<RustcForceInlineParser>,
         Single<TransparencyParser>,
         // tidy-alphabetical-end
     ];