[AsmParser] Use range-based for loops (NFC) (#140414)

Author: kazutakahirata

llvm/lib/AsmParser/LLParser.cpp

@@ -7468,8 +7468,8 @@ bool LLParser::parseSwitch(Instruction *&Inst, PerFunctionState &PFS) {
   Lex.Lex();  // Eat the ']'.
 
   SwitchInst *SI = SwitchInst::Create(Cond, DefaultBB, Table.size());
-  for (unsigned i = 0, e = Table.size(); i != e; ++i)
-    SI->addCase(Table[i].first, Table[i].second);
+  for (const auto &[OnVal, Dest] : Table)
+    SI->addCase(OnVal, Dest);
   Inst = SI;
   return false;
 }
@@ -8164,8 +8164,8 @@ int LLParser::parsePHI(Instruction *&Inst, PerFunctionState &PFS) {
   }
 
   PHINode *PN = PHINode::Create(Ty, PHIVals.size());
-  for (unsigned i = 0, e = PHIVals.size(); i != e; ++i)
-    PN->addIncoming(PHIVals[i].first, PHIVals[i].second);
+  for (const auto &[Val, BB] : PHIVals)
+    PN->addIncoming(Val, BB);
   Inst = PN;
   return AteExtraComma ? InstExtraComma : InstNormal;
 }