[NFC] [llvm-cov] Remove unnecessary logic from llvm-cov debuginfod.

Indexed profiles already have a sorted and uniqued binary ID list, and
due to this, duplicates are harmless in the list of binary IDs found,
since it's set_differenced from the list in the indexed profile.

Differential Revision: https://reviews.llvm.org/D136702

(cherry picked from commit 0a51eed)

Author: mysterymath

llvm/lib/ProfileData/Coverage/CoverageMapping.cpp

@@ -410,30 +410,21 @@ CoverageMapping::load(ArrayRef<StringRef> ObjectFilenames,
   }
 
   if (BIDFetcher) {
-    const auto &CompareLT = [](object::BuildIDRef A, object::BuildIDRef B) {
-      return StringRef(reinterpret_cast<const char *>(A.data()), A.size()) <
-             StringRef(reinterpret_cast<const char *>(B.data()), B.size());
-    };
-    const auto &CompareEQ = [](object::BuildIDRef A, object::BuildIDRef B) {
-      return StringRef(reinterpret_cast<const char *>(A.data()), A.size()) ==
-             StringRef(reinterpret_cast<const char *>(B.data()), B.size());
-    };
     std::vector<object::BuildID> ProfileBinaryIDs;
     if (Error E = ProfileReader->readBinaryIds(ProfileBinaryIDs))
       return createFileError(ProfileFilename, std::move(E));
-    llvm::sort(ProfileBinaryIDs, CompareLT);
-    ProfileBinaryIDs.erase(llvm::unique(ProfileBinaryIDs, CompareEQ),
-                           ProfileBinaryIDs.end());
 
     SmallVector<object::BuildIDRef> BinaryIDsToFetch;
     if (!ProfileBinaryIDs.empty()) {
-      llvm::sort(FoundBinaryIDs, CompareLT);
-      FoundBinaryIDs.erase(llvm::unique(FoundBinaryIDs, CompareEQ),
-                           FoundBinaryIDs.end());
+      const auto &Compare = [](object::BuildIDRef A, object::BuildIDRef B) {
+        return std::lexicographical_compare(A.begin(), A.end(), B.begin(),
+                                            B.end());
+      };
+      llvm::sort(FoundBinaryIDs, Compare);
       std::set_difference(
           ProfileBinaryIDs.begin(), ProfileBinaryIDs.end(),
           FoundBinaryIDs.begin(), FoundBinaryIDs.end(),
-          std::inserter(BinaryIDsToFetch, BinaryIDsToFetch.end()), CompareLT);
+          std::inserter(BinaryIDsToFetch, BinaryIDsToFetch.end()), Compare);
     }
 
     for (object::BuildIDRef BinaryID : BinaryIDsToFetch) {