[IR] Use llvm::upper_bound (NFC) (#139656)

Author: kazutakahirata

llvm/lib/IR/DataLayout.cpp

@@ -96,11 +96,10 @@ unsigned StructLayout::getElementContainingOffset(uint64_t FixedOffset) const {
   TypeSize Offset = TypeSize::getFixed(FixedOffset);
   ArrayRef<TypeSize> MemberOffsets = getMemberOffsets();
 
-  const auto *SI =
-      std::upper_bound(MemberOffsets.begin(), MemberOffsets.end(), Offset,
-                       [](TypeSize LHS, TypeSize RHS) -> bool {
-                         return TypeSize::isKnownLT(LHS, RHS);
-                       });
+  const auto *SI = llvm::upper_bound(MemberOffsets, Offset,
+                                     [](TypeSize LHS, TypeSize RHS) -> bool {
+                                       return TypeSize::isKnownLT(LHS, RHS);
+                                     });
   assert(SI != MemberOffsets.begin() && "Offset not in structure type!");
   --SI;
   assert(TypeSize::isKnownLE(*SI, Offset) && "upper_bound didn't work");