bitbake: codeparser: Small optimisation to stop repeated hash() calls

No functionality change, just avoids function call overhead in a
function which loops heavily.

(Bitbake rev: 633c0c19f87a92497a7e9771811cdc953e1b7047)

Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

bitbake/lib/bb/codeparser.py

@@ -65,9 +65,10 @@ class SetCache(object):
         for i in items:
             new.append(sys.intern(i))
         s = frozenset(new)
-        if hash(s) in self.setcache:
-            return self.setcache[hash(s)]
-        self.setcache[hash(s)] = s
+        h = hash(s)
+        if h in self.setcache:
+            return self.setcache[h]
+        self.setcache[h] = s
         return s
 
 codecache = SetCache()