DwarfDebug: Avoid unnecessary abbreviation lookup when emitting DIEs

DIEs already contain references directly to their DIEAbbrev, use that
instead of looking it up based on index.

llvm-svn: 196446
diff --git a/llvm/lib/CodeGen/AsmPrinter/DwarfDebug.h b/llvm/lib/CodeGen/AsmPrinter/DwarfDebug.h
index 9731a3d..15778f7 100644
--- a/llvm/lib/CodeGen/AsmPrinter/DwarfDebug.h
+++ b/llvm/lib/CodeGen/AsmPrinter/DwarfDebug.h
@@ -734,7 +734,7 @@
                                unsigned CUID);
 
   /// \brief Recursively Emits a debug information entry.
-  void emitDIE(DIE *Die, ArrayRef<DIEAbbrev *> Abbrevs);
+  void emitDIE(DIE *Die);
 
   // Experimental DWARF5 features.