CodeGenModule::EmitVTableBitSetEntries: Add check for identical bit set entries.

No two elements of this array should be the same, but the standard library
may pass the same element as both arguments to this function.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@230293 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/lib/CodeGen/CGVTables.cpp b/lib/CodeGen/CGVTables.cpp
index 14116e498ee52e699660eb3408cf34f1ac9c460d..2e8471eeb6c71f8bfd7e369d2dbb65ff5b77d78f 100644 (file)
--- a/lib/CodeGen/CGVTables.cpp
+++ b/lib/CodeGen/CGVTables.cpp
@@ -876,6 +876,9 @@ void CodeGenModule::EmitVTableBitSetEntries(llvm::GlobalVariable *VTable,
   // Sort the bit set entries for determinism.
   std::sort(BitsetEntries.begin(), BitsetEntries.end(), [](llvm::MDTuple *T1,
                                                            llvm::MDTuple *T2) {
+    if (T1 == T2)
+      return false;
+
     StringRef S1 = cast<llvm::MDString>(T1->getOperand(0))->getString();
     StringRef S2 = cast<llvm::MDString>(T2->getOperand(0))->getString();
     if (S1 < S2)