Apply clang-tidy's modernize-loop-convert to most of lib/Transforms.

Only minor manual fixes. No functionality change intended.

llvm-svn: 273808
diff --git a/llvm/lib/Transforms/Scalar/DeadStoreElimination.cpp b/llvm/lib/Transforms/Scalar/DeadStoreElimination.cpp
index 22d08e0..595a556 100644
--- a/llvm/lib/Transforms/Scalar/DeadStoreElimination.cpp
+++ b/llvm/lib/Transforms/Scalar/DeadStoreElimination.cpp
@@ -693,9 +693,8 @@
 
       // Stores to stack values are valid candidates for removal.
       bool AllDead = true;
-      for (SmallVectorImpl<Value *>::iterator I = Pointers.begin(),
-           E = Pointers.end(); I != E; ++I)
-        if (!DeadStackObjects.count(*I)) {
+      for (Value *Pointer : Pointers)
+        if (!DeadStackObjects.count(Pointer)) {
           AllDead = false;
           break;
         }