test/test_run: only check simplified hull generations for special options
test/test_run: only check simplified hull generations for special options

Commit 708e66dd7faa946dbbd01e94c108d53fd9f97c58 (test/test_run: also
check correctness of simplified hull generation) introduced
a correctness check on the simplified hull generation, but only
for those test cases where the (simplified) hull computation isn't
even performed.
Instead, we now test the computation for the special options test
cases, where the (simplified) hull does get computed.

heysion/cloog-clone,evaautomation/cloog,Distrotech/cloog,epowers/cloog,epowers/cloog,VanirLLVM/toolchain_cloog,epowers/cloog,evaautomation/cloog,periscop/cloog,heysion/cloog-clone,cfx-next/toolchain_cloog-upstream,Distrotech/cloog,periscop/cloog,SaberMod/cloog-current,UBERTC/cloog,cfx-next/toolchain_cloog-upstream,VanirLLVM/toolchain_cloog,SaberMod/cloog-current,UBERTC/cloog,UBERTC/cloog,heysion/cloog-clone,VanirLLVM/toolchain_cloog,Syllo/cloog,cfx-next/toolchain_cloog-upstream,Distrotech/cloog,Syllo/cloog