[llvm] Use std::tie to implement operator< (NFC)

llvm/include/llvm/DebugInfo/GSYM/FunctionInfo.h

@@ -234,11 +234,8 @@ inline bool operator!=(const FunctionInfo &LHS, const FunctionInfo &RHS) {
 /// the GSYM file.
 inline bool operator<(const FunctionInfo &LHS, const FunctionInfo &RHS) {
   // First sort by address range
-  if (LHS.Range != RHS.Range)
-    return LHS.Range < RHS.Range;
-  if (LHS.Inline == RHS.Inline)
-    return LHS.OptLineTable < RHS.OptLineTable;
-  return LHS.Inline < RHS.Inline;
+  return std::tie(LHS.Range, LHS.Inline, LHS.OptLineTable) <
+         std::tie(RHS.Range, RHS.Inline, RHS.OptLineTable);
 }
 
 raw_ostream &operator<<(raw_ostream &OS, const FunctionInfo &R);

llvm/include/llvm/MC/MCContext.h

@@ -259,13 +259,9 @@ class MCContext {
           SelectionKey(SelectionKey), UniqueID(UniqueID) {}
 
     bool operator<(const COFFSectionKey &Other) const {
-      if (SectionName != Other.SectionName)
-        return SectionName < Other.SectionName;
-      if (GroupName != Other.GroupName)
-        return GroupName < Other.GroupName;
-      if (SelectionKey != Other.SelectionKey)
-        return SelectionKey < Other.SelectionKey;
-      return UniqueID < Other.UniqueID;
+      return std::tie(SectionName, GroupName, SelectionKey, UniqueID) <
+             std::tie(Other.SectionName, Other.GroupName, Other.SelectionKey,
+                      Other.UniqueID);
     }
   };
 
@@ -279,11 +275,8 @@ class MCContext {
         : SectionName(SectionName), GroupName(GroupName), UniqueID(UniqueID) {}
 
     bool operator<(const WasmSectionKey &Other) const {
-      if (SectionName != Other.SectionName)
-        return SectionName < Other.SectionName;
-      if (GroupName != Other.GroupName)
-        return GroupName < Other.GroupName;
-      return UniqueID < Other.UniqueID;
+      return std::tie(SectionName, GroupName, UniqueID) <
+             std::tie(Other.SectionName, Other.GroupName, Other.UniqueID);
     }
   };
 

llvm/lib/Transforms/IPO/AttributorAttributes.cpp

@@ -10909,9 +10909,7 @@ struct AAPotentialValuesImpl : AAPotentialValues {
       return II.I == I && II.S == S;
     };
     bool operator<(const ItemInfo &II) const {
-      if (I == II.I)
-        return S < II.S;
-      return I < II.I;
+      return std::tie(I, S) < std::tie(II.I, II.S);
     };
   };