Change uses of Function::front to Function::getEntryBlock for readability.

llvm-svn: 35265
diff --git a/llvm/lib/Transforms/Utils/CodeExtractor.cpp b/llvm/lib/Transforms/Utils/CodeExtractor.cpp
index f304df2..a4e7ab8 100644
--- a/llvm/lib/Transforms/Utils/CodeExtractor.cpp
+++ b/llvm/lib/Transforms/Utils/CodeExtractor.cpp
@@ -104,7 +104,7 @@
   bool HasPredsFromRegion = false;
   unsigned NumPredsOutsideRegion = 0;
 
-  if (Header != &Header->getParent()->front()) {
+  if (Header != &Header->getParent()->getEntryBlock()) {
     PHINode *PN = dyn_cast<PHINode>(Header->begin());
     if (!PN) return;  // No PHI nodes.