[CodeGen] Use range-based for loops (NFC)

Author: kazutakahirata

llvm/lib/CodeGen/AsmPrinter/AsmPrinter.cpp

@@ -2878,17 +2878,16 @@ void AsmPrinter::emitConstantPool() {
   // Now print stuff into the calculated sections.
   const MCSection *CurSection = nullptr;
   unsigned Offset = 0;
-  for (unsigned i = 0, e = CPSections.size(); i != e; ++i) {
-    for (unsigned j = 0, ee = CPSections[i].CPEs.size(); j != ee; ++j) {
-      unsigned CPI = CPSections[i].CPEs[j];
+  for (const SectionCPs &CPSection : CPSections) {
+    for (unsigned CPI : CPSection.CPEs) {
       MCSymbol *Sym = GetCPISymbol(CPI);
       if (!Sym->isUndefined())
         continue;
 
-      if (CurSection != CPSections[i].S) {
-        OutStreamer->switchSection(CPSections[i].S);
-        emitAlignment(Align(CPSections[i].Alignment));
-        CurSection = CPSections[i].S;
+      if (CurSection != CPSection.S) {
+        OutStreamer->switchSection(CPSection.S);
+        emitAlignment(Align(CPSection.Alignment));
+        CurSection = CPSection.S;
         Offset = 0;
       }