Fix or remove code which seemed to think that the operand of a Constant
was always a User.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@129272 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Bitcode/Writer/ValueEnumerator.cpp b/lib/Bitcode/Writer/ValueEnumerator.cpp
index 05078ca..54404cd 100644
--- a/lib/Bitcode/Writer/ValueEnumerator.cpp
+++ b/lib/Bitcode/Writer/ValueEnumerator.cpp
@@ -423,7 +423,7 @@
     // This constant may have operands, make sure to enumerate the types in
     // them.
     for (unsigned i = 0, e = C->getNumOperands(); i != e; ++i) {
-      const User *Op = C->getOperand(i);
+      const Value *Op = C->getOperand(i);
       
       // Don't enumerate basic blocks here, this happens as operands to
       // blockaddress.