isl_pw_qpolynomial_print: fix printing of unnamed piecewise quasipolynomials
isl_pw_qpolynomial_print: fix printing of unnamed piecewise quasipolynomials

nicolasvasilache/isl,epowers/isl,pierrotdelalune/isl,serge-sans-paille/isl,Meinersbur/isl,Meinersbur/isl,crossbuild/isl,Meinersbur/isl,simbuerg/isl,SaberMod/isl-current,KangDroidSMProject/ISL,PollyLabs/isl,evaautomation/isl,jleben/isl,tobig/isl,pierrotdelalune/isl,PollyLabs/isl,tobig/isl,BenzoSM/isl,serge-sans-paille/isl,epowers/isl,epowers/isl,UBERTC/isl,simbuerg/isl,simbuerg/isl,evaautomation/isl,pierrotdelalune/isl,Meinersbur/isl,crossbuild/isl,BenzoSM/isl,BobSaget-Mod/libisl,UBERTC/isl,abduld/isl,Distrotech/isl,inducer/isl-mirror,serge-sans-paille/isl,nicolasvasilache/isl,epowers/isl,cfx-next/toolchain_isl-upstream,simbuerg/isl,VanirLLVM/toolchain_isl,cfx-next/toolchain_isl-upstream,cfx-next/toolchain_isl-upstream,KangDroidSMProject/ISL,VanirLLVM/toolchain_isl,simbuerg/isl,jleben/isl,Distrotech/isl,nicolasvasilache/isl,KangDroidSMProject/ISL,BobSaget-Mod/libisl,Distrotech/isl,nicolasvasilache/isl,VanirLLVM/toolchain_isl,pierrotdelalune/isl,tobig/isl,VanirLLVM/toolchain_isl,abduld/isl,PollyLabs/isl,BenzoSM/isl,jleben/isl,Distrotech/isl,PollyLabs/isl,PollyLabs/isl,tobig/isl,crossbuild/isl,cfx-next/toolchain_isl-upstream,crossbuild/isl,cfx-next/toolchain_isl-upstream,BobSaget-Mod/libisl,evaautomation/isl,abduld/isl,KangDroidSMProject/ISL,SaberMod/isl-current,pierrotdelalune/isl,SaberMod/isl-current,abduld/isl,VanirLLVM/toolchain_isl,SaberMod/isl-current,jleben/isl,BenzoSM/isl,inducer/isl-mirror,nicolasvasilache/isl,jleben/isl,KangDroidSMProject/ISL,inducer/isl-mirror,BobSaget-Mod/libisl,inducer/isl-mirror,inducer/isl-mirror,UBERTC/isl,Distrotech/isl,BobSaget-Mod/libisl,evaautomation/isl,serge-sans-paille/isl,serge-sans-paille/isl,UBERTC/isl,epowers/isl,BenzoSM/isl