const'ify jump table stuff


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@31269 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/CodeGen/MachineFunction.cpp b/lib/CodeGen/MachineFunction.cpp
index 7617de9..5d82f72 100644
--- a/lib/CodeGen/MachineFunction.cpp
+++ b/lib/CodeGen/MachineFunction.cpp
@@ -362,7 +362,7 @@
 /// or return an existing one.
 ///
 unsigned MachineJumpTableInfo::getJumpTableIndex(
-                                     std::vector<MachineBasicBlock*> &DestBBs) {
+                               const std::vector<MachineBasicBlock*> &DestBBs) {
   assert(!DestBBs.empty() && "Cannot create an empty jump table!");
   for (unsigned i = 0, e = JumpTables.size(); i != e; ++i)
     if (JumpTables[i].MBBs == DestBBs)