Add support for GCC compatible builtin setjmp and longjmp intrinsics. This is

a supporting preliminary patch for GCC-compatible SjLJ exception handling. Note that these intrinsics are not designed to be invoked directly by the user, but
rather used by the front-end as target hooks for exception handling.

llvm-svn: 71610

llvm/lib/CodeGen/MachineFunction.cpp

@@ -121,6 +121,7 @@ MachineFunction::MachineFunction(const Function *F,
                   MachineRegisterInfo(*TM.getRegisterInfo());
   else
     RegInfo = 0;
+  HasBuiltinSetjmp = false;
   MFInfo = 0;
   FrameInfo = new (Allocator.Allocate<MachineFrameInfo>())
                   MachineFrameInfo(*TM.getFrameInfo());