[clang] Use std::tie to implement operator< (NFC) (llvm#139438)

Author: kazutakahirata

clang/include/clang/Driver/Compilation.h

@@ -90,14 +90,8 @@ class Compilation {
         : TC(TC), BoundArch(BoundArch), DeviceOffloadKind(DeviceOffloadKind) {}
 
     bool operator<(const TCArgsKey &K) const {
-      if (TC < K.TC)
-        return true;
-      else if (TC == K.TC && BoundArch < K.BoundArch)
-        return true;
-      else if (TC == K.TC && BoundArch == K.BoundArch &&
-               DeviceOffloadKind < K.DeviceOffloadKind)
-        return true;
-      return false;
+      return std::tie(TC, BoundArch, DeviceOffloadKind) <
+             std::tie(K.TC, K.BoundArch, K.DeviceOffloadKind);
     }
   };
   std::map<TCArgsKey, llvm::opt::DerivedArgList *> TCArgs;

clang/lib/Frontend/FrontendAction.cpp

@@ -100,11 +100,7 @@ class DeserializedDeclsSourceRangePrinter : public ASTConsumer,
     unsigned Column;
 
     bool operator<(const Position &other) const {
-      if (Line < other.Line)
-        return true;
-      if (Line > other.Line)
-        return false;
-      return Column < other.Column;
+      return std::tie(Line, Column) < std::tie(other.Line, other.Column);
     }
 
     static Position GetBeginSpelling(const SourceManager &SM,

clang/lib/StaticAnalyzer/Checkers/TestAfterDivZeroChecker.cpp

@@ -41,11 +41,8 @@ class ZeroState {
   }
 
   bool operator<(const ZeroState &X) const {
-    if (BlockID != X.BlockID)
-      return BlockID < X.BlockID;
-    if (SFC != X.SFC)
-      return SFC < X.SFC;
-    return ZeroSymbol < X.ZeroSymbol;
+    return std::tie(BlockID, SFC, ZeroSymbol) <
+           std::tie(X.BlockID, X.SFC, X.ZeroSymbol);
   }
 
   void Profile(llvm::FoldingSetNodeID &ID) const {