Backport a fix for duplicate debug data errors

lib/CodeGen/AsmPrinter/DwarfDebug.cpp

@@ -205,9 +205,34 @@ ArrayRef<DbgVariable::FrameIndexExpr> DbgVariable::getFrameIndexExprs() const {
               return A.Expr->getFragmentInfo()->OffsetInBits <
                      B.Expr->getFragmentInfo()->OffsetInBits;
             });
+
   return FrameIndexExprs;
 }
 
+void DbgVariable::addMMIEntry(const DbgVariable &V) {
+  assert(DebugLocListIndex == ~0U && !MInsn && "not an MMI entry");
+  assert(V.DebugLocListIndex == ~0U && !V.MInsn && "not an MMI entry");
+  assert(V.Var == Var && "conflicting variable");
+  assert(V.IA == IA && "conflicting inlined-at location");
+
+  assert(!FrameIndexExprs.empty() && "Expected an MMI entry");
+  assert(!V.FrameIndexExprs.empty() && "Expected an MMI entry");
+
+  for (const auto &FIE : V.FrameIndexExprs)
+    // Ignore duplicate entries.
+    if (llvm::none_of(FrameIndexExprs, [&](const FrameIndexExpr &Other) {
+          return FIE.FI == Other.FI && FIE.Expr == Other.Expr;
+        }))
+      FrameIndexExprs.push_back(FIE);
+
+  assert((FrameIndexExprs.size() == 1 ||
+          llvm::all_of(FrameIndexExprs,
+                       [](FrameIndexExpr &FIE) {
+                         return FIE.Expr && FIE.Expr->isFragment();
+                       })) &&
+         "conflicting locations for variable");
+}
+
 static const DwarfAccelTable::Atom TypeAtoms[] = {
     DwarfAccelTable::Atom(dwarf::DW_ATOM_die_offset, dwarf::DW_FORM_data4),
     DwarfAccelTable::Atom(dwarf::DW_ATOM_die_tag, dwarf::DW_FORM_data2),

lib/CodeGen/AsmPrinter/DwarfDebug.h

@@ -124,23 +124,7 @@ class DbgVariable {
   /// Get the FI entries, sorted by fragment offset.
   ArrayRef<FrameIndexExpr> getFrameIndexExprs() const;
   bool hasFrameIndexExprs() const { return !FrameIndexExprs.empty(); }
-
-  void addMMIEntry(const DbgVariable &V) {
-    assert(DebugLocListIndex == ~0U && !MInsn && "not an MMI entry");
-    assert(V.DebugLocListIndex == ~0U && !V.MInsn && "not an MMI entry");
-    assert(V.Var == Var && "conflicting variable");
-    assert(V.IA == IA && "conflicting inlined-at location");
-
-    assert(!FrameIndexExprs.empty() && "Expected an MMI entry");
-    assert(!V.FrameIndexExprs.empty() && "Expected an MMI entry");
-
-    FrameIndexExprs.append(V.FrameIndexExprs.begin(), V.FrameIndexExprs.end());
-    assert(all_of(FrameIndexExprs,
-                  [](FrameIndexExpr &FIE) {
-                    return FIE.Expr && FIE.Expr->isFragment();
-                  }) &&
-           "conflicting locations for variable");
-  }
+  void addMMIEntry(const DbgVariable &V);
 
   // Translate tag to proper Dwarf tag.
   dwarf::Tag getTag() const {