[llvm-exegesis] Use range-based for loops (NFC)

Author: kazutakahirata

llvm/tools/llvm-exegesis/lib/Clustering.cpp

@@ -307,10 +307,8 @@ void BenchmarkClustering::stabilize(unsigned NumOpcodes) {
       assert(std::distance(it, OldCluster.PointIndices.end()) > 0 &&
              "Should have found at least one bad point");
       // Mark to-be-moved points as belonging to the new cluster.
-      std::for_each(it, OldCluster.PointIndices.end(),
-                    [this, &UnstableCluster](size_t P) {
-                      ClusterIdForPoint_[P] = UnstableCluster.Id;
-                    });
+      for (size_t P : llvm::make_range(it, OldCluster.PointIndices.end()))
+        ClusterIdForPoint_[P] = UnstableCluster.Id;
       // Actually append to-be-moved points to the new cluster.
       UnstableCluster.PointIndices.insert(UnstableCluster.PointIndices.end(),
                                           it, OldCluster.PointIndices.end());

llvm/tools/llvm-exegesis/llvm-exegesis.cpp

@@ -503,11 +503,8 @@ void benchmarkMain() {
   }
 
   BitVector AllReservedRegs;
-  llvm::for_each(Repetitors,
-                 [&AllReservedRegs](
-                     const std::unique_ptr<const SnippetRepetitor> &Repetitor) {
-                   AllReservedRegs |= Repetitor->getReservedRegs();
-                 });
+  for (const std::unique_ptr<const SnippetRepetitor> &Repetitor : Repetitors)
+    AllReservedRegs |= Repetitor->getReservedRegs();
 
   std::vector<BenchmarkCode> Configurations;
   if (!Opcodes.empty()) {