Simplify code by using SmallVector's pop_back_val() instead of
separate back() and pop_back() calls.

llvm-svn: 71089
diff --git a/llvm/lib/Transforms/Utils/Local.cpp b/llvm/lib/Transforms/Utils/Local.cpp
index 4f2bb1e..94483b8 100644
--- a/llvm/lib/Transforms/Utils/Local.cpp
+++ b/llvm/lib/Transforms/Utils/Local.cpp
@@ -188,8 +188,7 @@
   DeadInsts.push_back(I);
   
   while (!DeadInsts.empty()) {
-    I = DeadInsts.back();
-    DeadInsts.pop_back();
+    I = DeadInsts.pop_back_val();
 
     // Null out all of the instruction's operands to see if any operand becomes
     // dead as we go.