when writing out the analysis cache for core we need to set :infer-externs to true

Author: dnolen

src/main/clojure/cljs/build/api.clj

@@ -89,7 +89,7 @@
    (src-file->goog-require
      (if-not (nil? env/*compiler*)
        env/*compiler*
-       (env/default-compiler-env))
+       (env/default-compiler-env options))
      src options))
   ([state src options]
    (env/with-compiler-env state

src/main/clojure/cljs/closure.clj

@@ -2306,7 +2306,7 @@
         cache     (io/file base-path "core.cljs.cache.aot.edn")
         tcache    (io/file base-path "core.cljs.cache.aot.json")]
     (util/mkdirs dest)
-    (env/with-compiler-env (env/default-compiler-env)
+    (env/with-compiler-env (env/default-compiler-env {:infer-externs true})
       (comp/compile-file src dest
         {:source-map true
          :source-map-url "core.js.map"