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When scanning the function for CSRs uses and defs, also check if the basic block are landing pads. Consider that landing pads needs the CSRs to be properly set. That way we force the prologue/epilogue to always be pushed out of the problematic "throw" region. The "throw" region is problematic because the jumps are not properly modeled. Fixes PR36513 llvm-svn: 327942
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