Don't debug assert on broken link in moduleNameResolver (microsoft#55649)

Author: jakebailey

src/compiler/moduleNameResolver.ts

@@ -1921,7 +1921,6 @@ function realPath(path: string, host: ModuleResolutionHost, traceEnabled: boolea
     if (traceEnabled) {
         trace(host, Diagnostics.Resolving_real_path_for_0_result_1, path, real);
     }
-    Debug.assert(host.fileExists(real), `${path} linked to nonexistent file ${real}`);
     return real;
 }