Target option DisableJumpTables is a gross hack. Move it to TargetLowering instead.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@159611 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/CodeGen/SelectionDAG/TargetLowering.cpp b/lib/CodeGen/SelectionDAG/TargetLowering.cpp
index 2020cc7..6212918 100644
--- a/lib/CodeGen/SelectionDAG/TargetLowering.cpp
+++ b/lib/CodeGen/SelectionDAG/TargetLowering.cpp
@@ -612,6 +612,7 @@
   MinStackArgumentAlignment = 1;
   ShouldFoldAtomicFences = false;
   InsertFencesForAtomic = false;
+  SupportJumpTables = true;
 
   InitLibcallNames(LibcallRoutineNames);
   InitCmpLibcallCCs(CmpLibcallCCs);