CLJS-1818: (hash false) returns different value from Clojure

mirrors Clojure's and JVM's behavior of returning fixed prime numbers
as the hashCode of true and false.

http://docs.oracle.com/javase/7/docs/api/java/lang/Boolean.html#hashCode%28%29

Author: anmonteiro

src/main/cljs/cljs/core.cljs

@@ -902,9 +902,12 @@
         -1048576
         2146959360))
 
-    (true? o) 1
+    ;; note: mirrors Clojure's behavior on the JVM, where the hashCode is
+    ;; 1231 for true and 1237 for false
+    ;; http://docs.oracle.com/javase/7/docs/api/java/lang/Boolean.html#hashCode%28%29
+    (true? o) 1231
 
-    (false? o) 0
+    (false? o) 1237
 
     (string? o)
     (m3-hash-int (hash-string o))

src/test/cljs/cljs/hashing_test.cljs

@@ -87,4 +87,8 @@
     (is (== (imul -2 -2) 4))
     (is (== (imul 0xffffffff 5) -5))
     (is (== (imul 0xfffffffe 5) -10))
-    ))
+    ))
+
+(deftest test-cljs-1818
+  (is (= (hash true) 1231))
+  (is (= (hash false) 1237)))