perf(semantic): pre-size class elements hash map (#22618)

crates/oxc_semantic/src/checker/javascript.rs

@@ -1,5 +1,5 @@
 use memchr::memchr_iter;
-use rustc_hash::FxHashMap;
+use rustc_hash::{FxBuildHasher, FxHashMap};
 
 use oxc_allocator::GetAddress;
 use oxc_ast::{AstKind, ModuleDeclarationKind, ast::*};
@@ -81,8 +81,9 @@ pub fn check_import_value_redeclarations(ctx: &SemanticBuilder<'_>) {
 pub fn check_duplicate_class_elements(ctx: &SemanticBuilder<'_>) {
     let classes = &ctx.class_table_builder.classes;
     classes.iter_enumerated().for_each(|(class_id, _)| {
-        let mut defined_elements = FxHashMap::default();
         let elements = &classes.elements[class_id];
+        let mut defined_elements =
+            FxHashMap::with_capacity_and_hasher(elements.len(), FxBuildHasher);
         for (element_id, element) in elements.iter_enumerated() {
             if let Some(prev_element_id) = defined_elements.insert(&element.name, element_id) {
                 let prev_element = &elements[prev_element_id];