fix constant table stability issue

Analysis cache loading path would not correctly merge in all data
collected from analyzing dependencies (would drop accumulated
constants).

Author: swannodette

src/main/clojure/cljs/analyzer.cljc

@@ -2691,8 +2691,11 @@
                           (recur (rest forms))))
                       (throw (AssertionError. (str "No ns form found in " src)))))))]
           (when (false? (:restore opts))
-            (swap! env/*compiler* update-in [::namespaces] merge
-              (get compiler-env' ::namespaces)))
+            (swap! env/*compiler*
+              (fn [old-state]
+                (-> old-state
+                  (update-in [::namespaces] merge (get compiler-env' ::namespaces))
+                  (update-in [::constant-table] merge (get compiler-env' ::constant-table))))))
           ijs)))))
 
 #?(:clj

src/main/clojure/cljs/env.cljc

@@ -42,6 +42,7 @@ state that is accessed/maintained by many different components."}
   ([] (default-compiler-env {}))
   ([options]
      (atom (merge {:cljs.analyzer/namespaces {'cljs.user {:name 'cljs.user}}
+                   :cljs.analyzer/constant-table {}
                    :options options}
              #?(:clj {:js-dependency-index (js-dependency-index options)})))))