add an assertion

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@31272 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/include/llvm/CodeGen/MachineJumpTableInfo.h b/include/llvm/CodeGen/MachineJumpTableInfo.h
index 2d640a7cb102ddaf3c43f5a0fa070eca2a129a8f..aa2981c4bbd2ba841acbd318ece0d2cd0e407f83 100644 (file)
--- a/include/llvm/CodeGen/MachineJumpTableInfo.h
+++ b/include/llvm/CodeGen/MachineJumpTableInfo.h
@@ -64,6 +64,7 @@ public:
   /// ReplaceMBBInJumpTables - If Old is the target of any jump tables, update
   /// the jump tables to branch to New instead.
   bool ReplaceMBBInJumpTables(MachineBasicBlock *Old, MachineBasicBlock *New) {
+    assert(Old != New && "Not making a change?");
     bool MadeChange = false;
     for (unsigned i = 0, e = JumpTables.size(); i != e; ++i) {
       MachineJumpTableEntry &JTE = JumpTables[i];