wasm: fix crash when disposing crashed process

If the wasm process crashes during Process#createDocumentForVSCodeAsync,
then DocumentLinter#disposeAsync is called, DocumentLinter#disposeAsync
throws. This is undesired; disposing shouldn't throw.

Fix DocumentLinter#disposeAsync to not throw if the wasm process
crashes.

Author: strager

wasm/quick-lint-js.js

@@ -99,7 +99,11 @@ class DocumentLinter {
         try {
           await this._parserPromise;
         } catch (e) {
-          if (!(e instanceof DocumentLinterDisposed)) {
+          if (e instanceof DocumentLinterDisposed) {
+            // Ignore.
+          } else if (e instanceof ProcessCrashed) {
+            // Ignore.
+          } else {
             throw e;
           }
         }

wasm/test-document.js

@@ -355,11 +355,8 @@ describe("DocumentLinter", () => {
           ]);
         }
       } finally {
-        // TODO(strager): disposeAsync sometimes crashes. Fix the crashes.
-        if (false) {
-          if (linter !== null) {
-            await linter.disposeAsync();
-          }
+        if (linter !== null) {
+          await linter.disposeAsync();
         }
       }