perf(parser): inline end_span and parse_identifier_kind which are on the hot path (#2612)

Cargo.toml

@@ -146,8 +146,8 @@ opt-level = 'z'
 opt-level     = 3
 lto           = "fat"
 codegen-units = 1
-strip         = "symbols"
-debug         = false
+strip         = false
+debug         = true
 panic         = "abort"   # Let it crash and force ourselves to write safe Rust.
 
 # Use the `--profile release-debug` flag to show symbols in release mode.

crates/oxc_parser/src/cursor.rs

@@ -24,8 +24,8 @@ impl<'a> ParserImpl<'a> {
         Span::new(token.start, 0)
     }
 
-    pub(crate) fn end_span(&self, span: Span) -> Span {
-        let mut span = span;
+    #[inline]
+    pub(crate) fn end_span(&self, mut span: Span) -> Span {
         span.end = self.prev_token_end;
         span
     }

crates/oxc_parser/src/js/expression.rs

@@ -102,6 +102,7 @@ impl<'a> ParserImpl<'a> {
         IdentifierName { span, name }
     }
 
+    #[inline]
     pub(crate) fn parse_identifier_kind(&mut self, kind: Kind) -> (Span, Atom<'a>) {
         let span = self.start_span();
         let name = self.cur_string();