perf(es/parser): Remove unnecessary check (#9102)

**Description:**

We can skip some checks for error recovery.

.github/workflows/CI.yml

@@ -668,7 +668,7 @@ jobs:
             swc-exec-cache-${{ matrix.settings.crate }}
 
       - name: Run cargo test
-        if: matrix.settings.crate != 'swc_plugin_runner' && matrix.settings.crate != 'swc_ecma_minifier' && matrix.settings.crate != 'swc_core' && matrix.settings.crate != 'swc_ecma_quote' && matrix.settings.crate != 'swc_cli' && matrix.settings.crate != 'binding_core_wasm'
+        if: matrix.settings.crate != 'swc_plugin_runner' && matrix.settings.crate != 'swc_ecma_parser' && matrix.settings.crate != 'swc_ecma_minifier' && matrix.settings.crate != 'swc_core' && matrix.settings.crate != 'swc_ecma_quote' && matrix.settings.crate != 'swc_cli' && matrix.settings.crate != 'binding_core_wasm'
         run: |
           cargo test -p ${{ matrix.settings.crate }}
 
@@ -699,6 +699,11 @@ jobs:
         run: |
           cargo test -p swc_ecma_minifier --features concurrent
 
+      - name: Run cargo test (swc_ecma_parser)
+        if: matrix.settings.crate == 'swc_ecma_parser'
+        run: |
+          cargo test -p swc_ecma_parser --features verify
+
       - name: Run cargo test (all features)
         if: matrix.settings.crate == 'swc_ecma_parser' || matrix.settings.crate == 'swc_ecma_loader'
         run: |

crates/swc_ecma_parser/src/parser/util.rs

@@ -60,7 +60,12 @@ impl Context {
         }
     }
 
+    #[cfg_attr(not(feature = "verify"), inline(always))]
     pub fn is_reserved_word(self, word: &Atom) -> bool {
+        if !cfg!(feature = "verify") {
+            return false;
+        }
+
         match &**word {
             "let" => self.strict,
             // SyntaxError in the module only, not in the strict.