GS implementation uses the masked.{gather,store} intrinsics,
introduced in llvm-3.9.0. swr llvm version requirement in
automake and scons now match (scons already needed >= 3.9).
Reviewed-by: Bruce Cherniak <bruce.cherniak@intel.com>
LLVM_REQUIRED_R600=3.6.0
LLVM_REQUIRED_RADEONSI=3.6.0
LLVM_REQUIRED_RADV=3.9.0
LLVM_REQUIRED_R600=3.6.0
LLVM_REQUIRED_RADEONSI=3.6.0
LLVM_REQUIRED_RADV=3.9.0
dnl Check for progs
AC_PROG_CPP
dnl Check for progs
AC_PROG_CPP