initialize new flag

llvm-svn: 23480
diff --git a/llvm/lib/Target/TargetLowering.cpp b/llvm/lib/Target/TargetLowering.cpp
index 3c2a09c..c4ccbf5 100644
--- a/llvm/lib/Target/TargetLowering.cpp
+++ b/llvm/lib/Target/TargetLowering.cpp
@@ -29,6 +29,7 @@
   memset(RegClassForVT, 0,MVT::LAST_VALUETYPE*sizeof(TargetRegisterClass*));
   maxStoresPerMemSet = maxStoresPerMemCpy = maxStoresPerMemMove = 8;
   allowUnalignedMemoryAccesses = false;
+  UseUnderscoreSetJmpLongJmp = false;
 }
 
 TargetLowering::~TargetLowering() {}