change Target.getInstructionsByEnumValue to return a reference
to a vector that CGT stores instead of synthesizing it on every 
call.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@98910 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/utils/TableGen/InstrEnumEmitter.cpp b/utils/TableGen/InstrEnumEmitter.cpp
index d1e7f3d..4162107 100644
--- a/utils/TableGen/InstrEnumEmitter.cpp
+++ b/utils/TableGen/InstrEnumEmitter.cpp
@@ -40,8 +40,8 @@
     exit(1);
   }
 
-  std::vector<const CodeGenInstruction*> NumberedInstructions;
-  Target.getInstructionsByEnumValue(NumberedInstructions);
+  const std::vector<const CodeGenInstruction*> &NumberedInstructions =
+    Target.getInstructionsByEnumValue();
 
   OS << "namespace " << Namespace << " {\n";
   OS << "  enum {\n";