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Summary: Check if the parent basic block and caller exists before calling CS.getCaller when constant folding strip.invariant.group instrinsic. This avoids a crash when the function containing the intrinsic is being inlined. The instruction is checked for any simplifiction but has not yet been added to a basic block. Reviewers: Prazek, rsmith, efriedma Reviewed By: efriedma Subscribers: eraman, llvm-commits Differential Revision: https://reviews.llvm.org/D49690 llvm-svn: 337742
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