templater: move runtemplate function out of buildmap/runmap pair

The next patch will introduce buildtemplate function that should be defined
near runtemplate. But I don't want to insert it between buildmap and runmap.

mercurial/templater.py

@@ -174,6 +174,10 b' def runsymbol(context, mapping, key):'
         v = list(v)
     return v
 
+def runtemplate(context, mapping, template):
+    for func, data in template:
+        yield func(context, mapping, data)
+
 def buildfilter(exp, context):
     func, data = compileexp(exp[1], context, methods)
     filt = getfilter(exp[2], context)
@@ -201,10 +205,6 b' def buildmap(exp, context):'
     ctmpl = gettemplate(exp[2], context)
     return (runmap, (func, data, ctmpl))
 
-def runtemplate(context, mapping, template):
-    for func, data in template:
-        yield func(context, mapping, data)
-
 def runmap(context, mapping, data):
     func, data, ctmpl = data
     d = func(context, mapping, data)