(Almost) always call reserveOperandSpace() on newly created PHINodes.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@128535 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Transforms/InstCombine/InstCombinePHI.cpp b/lib/Transforms/InstCombine/InstCombinePHI.cpp
index 2c0714b..9e2e181 100644
--- a/lib/Transforms/InstCombine/InstCombinePHI.cpp
+++ b/lib/Transforms/InstCombine/InstCombinePHI.cpp
@@ -700,6 +700,7 @@
       
       // Otherwise, Create the new PHI node for this user.
       EltPHI = PHINode::Create(Ty, PN->getName()+".off"+Twine(Offset), PN);
+      EltPHI->reserveOperandSpace(PN->getNumIncomingValues());
       assert(EltPHI->getType() != PN->getType() &&
              "Truncate didn't shrink phi?");