Optimize away a len call in InlineProcessor

- just get the length once at the beginning.

The gains are tiny but when the total number of calls to these is in the hundreds of thousands, it makes a sizeable difference.

Author: oprypin

markdown/treeprocessors.py

@@ -126,7 +126,8 @@ def __handleInline(self, data, patternIndex=0):
         """
         if not isinstance(data, util.AtomicString):
             startIndex = 0
-            while patternIndex < len(self.inlinePatterns):
+            count = len(self.inlinePatterns)
+            while patternIndex < count:
                 data, matched, startIndex = self.__applyPattern(
                     self.inlinePatterns[patternIndex], data, patternIndex, startIndex
                 )