[BOLT][NFC] Use for_each to simplify printLoopInfo

[rafauler]

LGTM

bolt/lib/Core/BinaryFunction.cpp

 #include "bolt/Core/BinaryFunction.h"
 #include "bolt/Core/BinaryBasicBlock.h"
 #include "bolt/Core/BinaryDomTree.h"
 #include "bolt/Core/DynoStats.h"
 #include "bolt/Core/MCPlusBuilder.h"
 #include "bolt/Utils/NameResolver.h"
 #include "bolt/Utils/NameShortener.h"
 #include "bolt/Utils/Utils.h"
+#include "llvm/ADT/STLExtras.h"
 #include "llvm/ADT/SmallSet.h"
 #include "llvm/ADT/StringRef.h"
 #include "llvm/ADT/edit_distance.h"
 #include "llvm/Demangle/Demangle.h"
 #include "llvm/MC/MCAsmInfo.h"
 #include "llvm/MC/MCAsmLayout.h"
 #include "llvm/MC/MCContext.h"
 #include "llvm/MC/MCDisassembler/MCDisassembler.h"

 
 void BinaryFunction::printLoopInfo(raw_ostream &OS) const {
   OS << "Loop Info for Function \"" << *this << "\"";
   if (hasValidProfile())
     OS << " (count: " << getExecutionCount() << ")";
   OS << "\n";
 
   std::stack<BinaryLoop *> St;
-  for (auto I = BLI->begin(), E = BLI->end(); I != E; ++I)
-    St.push(*I);
+  for_each(*BLI, [&](BinaryLoop *L) { St.push(L); });
   while (!St.empty()) {
     BinaryLoop *L = St.top();
     St.pop();
 
-    for (BinaryLoop::iterator I = L->begin(), E = L->end(); I != E; ++I)
-      St.push(*I);
+    for_each(*L, [&](BinaryLoop *Inner) { St.push(Inner); });
 
     if (!hasValidProfile())
       continue;
 
     OS << (L->getLoopDepth() > 1 ? "Nested" : "Outer")
        << " loop header: " << L->getHeader()->getName();
     OS << "\n";
     OS << "Loop basic blocks: ";