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Changes:
- IntrinsicCleaner accepts fshr/fshl as accepted intrinsics
- Executor::executeCall converts fshr/fshl to urem/zext/concat/shift/extract
- Klee/main suppresses warnings about externals that are LLVM reserved
(i.e., begin with "llvm.")
- New test exercises 32 and 7 bit versions including oversize shift values
Test values are based on LLVM's test for fshl/fshr
- Changes that depend on existence of fshr/fshl are guarded by
#if LLVM_VERSION_CODE >= LLVM_VERSION(7, 0)
or
; REQUIRES: geq-llvm-7.0
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