Set ReturnsTwice attribute on call to eh_sjlj_setjmp #358
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This fixes a code generation problem in Cheetah's
sync_in_personalitywhere a call is converted to a tail call (branch instruction) despite the need to keep the frame alive. The tail call optimization is not done on functions that call a returns-twice function.I haven't figured out when this broke. The llvm team doesn't care about
__builtin_setjmpexcept as a legacy tool to support exceptions on some old platforms.