configure.ac: increase required swr llvm to 3.9.0
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>
diff --git a/configure.ac b/configure.ac
index 943bc05..73bd749 100644
--- a/configure.ac
+++ b/configure.ac
@@ -107,7 +107,7 @@
LLVM_REQUIRED_R600=3.6.0
LLVM_REQUIRED_RADEONSI=3.6.0
LLVM_REQUIRED_RADV=3.9.0
-LLVM_REQUIRED_SWR=3.6.0
+LLVM_REQUIRED_SWR=3.9.0
dnl Check for progs
AC_PROG_CPP