[llvm] r268266 - ReversePostOrderFunctionAttrs is not modifying the call graph, let's preserve it.

[Mehdi Amini via llvm-commits]

Author: mehdi_amini
Date: Mon May  2 13:03:33 2016
New Revision: 268266

URL: http://llvm.org/viewvc/llvm-project?rev=268266&view=rev
Log:
ReversePostOrderFunctionAttrs is not modifying the call graph, let's preserve it.

When running cc1 with -flto=thin, it is followed by GlobalOpt, which
requires the callgraph. This saves rebuilding one.

From: Mehdi Amini <mehdi.amini at apple.com>

Modified:
    llvm/trunk/lib/Transforms/IPO/FunctionAttrs.cpp

Modified: llvm/trunk/lib/Transforms/IPO/FunctionAttrs.cpp
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/Transforms/IPO/FunctionAttrs.cpp?rev=268266&r1=268265&r2=268266&view=diff
==============================================================================
--- llvm/trunk/lib/Transforms/IPO/FunctionAttrs.cpp (original)
+++ llvm/trunk/lib/Transforms/IPO/FunctionAttrs.cpp Mon May  2 13:03:33 2016
@@ -1153,6 +1153,7 @@ struct ReversePostOrderFunctionAttrs : p
   void getAnalysisUsage(AnalysisUsage &AU) const override {
     AU.setPreservesCFG();
     AU.addRequired<CallGraphWrapperPass>();
+    AU.addPreserved<CallGraphWrapperPass>();
   }
 };
 }