DebugInfo: Simplify the AddressPool representation

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@185189 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/CodeGen/AsmPrinter/DwarfDebug.h b/lib/CodeGen/AsmPrinter/DwarfDebug.h
index 4a395a3..00d48d7 100644
--- a/lib/CodeGen/AsmPrinter/DwarfDebug.h
+++ b/lib/CodeGen/AsmPrinter/DwarfDebug.h
@@ -195,10 +195,9 @@
 typedef StringMap<std::pair<MCSymbol*, unsigned>,
                   BumpPtrAllocator&> StrPool;
 
-// A Symbol->pair<Symbol, unsigned> mapping of addresses used by indirect
+// A Symbol->unsigned mapping of addresses used by indirect
 // references.
-typedef DenseMap<const MCSymbol *, std::pair<const MCSymbol *, unsigned> >
-    AddrPool;
+typedef DenseMap<const MCSymbol *, unsigned> AddrPool;
 
 /// \brief Collects and handles information specific to a particular
 /// collection of units.