MergeFunc: Quick fix for r245140, Ignore second, aka Function*, in sorting.

Don't assume second would be ordered in the module.

llvm-svn: 245168

1 files changed, 6 insertions, 1 deletions

diff --git a/llvm/lib/Transforms/IPO/MergeFunctions.cpp b/llvm/lib/Transforms/IPO/MergeFunctions.cpp
index 1c9d2170f92..67d6b7fcb67 100644
--- a/llvm/lib/Transforms/IPO/MergeFunctions.cpp
+++ b/llvm/lib/Transforms/IPO/MergeFunctions.cpp
@@ -1316,7 +1316,12 @@ bool MergeFunctions::runOnModule(Module &M) {
     } 
   }
 
-  std::sort(HashedFuncs.begin(), HashedFuncs.end());
+  std::stable_sort(
+      HashedFuncs.begin(), HashedFuncs.end(),
+      [](const std::pair<FunctionComparator::FunctionHash, Function *> &a,
+         const std::pair<FunctionComparator::FunctionHash, Function *> &b) {
+        return a.first < b.first;
+      });
 
   auto S = HashedFuncs.begin();
   for (auto I = HashedFuncs.begin(), IE = HashedFuncs.end(); I != IE; ++I) {