Index: ELF/DWARF.cpp
===================================================================
--- ELF/DWARF.cpp
+++ ELF/DWARF.cpp
@@ -81,9 +81,8 @@
 Optional<RelocAddrEntry>
 LLDDwarfObj<ELFT>::findAux(const InputSectionBase &Sec, uint64_t Pos,
                            ArrayRef<RelTy> Rels) const {
-  auto It = std::lower_bound(
-      Rels.begin(), Rels.end(), Pos,
-      [](const RelTy &A, uint64_t B) { return A.r_offset < B; });
+  auto It =
+      llvm::bsearch(Rels, [Pos](const RelTy &A) { return Pos <= A.r_offset; });
   if (It == Rels.end() || It->r_offset != Pos)
     return None;
   const RelTy &Rel = *It;
Index: ELF/InputSection.cpp
===================================================================
--- ELF/InputSection.cpp
+++ ELF/InputSection.cpp
@@ -1224,11 +1224,9 @@
 
   // If Offset is not at beginning of a section piece, it is not in the map.
   // In that case we need to  do a binary search of the original section piece vector.
-  auto It2 =
-      llvm::upper_bound(Pieces, Offset, [](uint64_t Offset, SectionPiece P) {
-        return Offset < P.InputOff;
-      });
-  return &It2[-1];
+  auto It = llvm::bsearch(
+      Pieces, [Offset](SectionPiece P) { return Offset < P.InputOff; });
+  return &It[-1];
 }
 
 // Returns the offset in an output section for a given input offset.