[i386] add missing --with-cpu entries

[Richard Henderson]

        * config.gcc (x86_64-*): Add core-avx-i, core-avx2 for with_cpu.

diff --git a/gcc/config.gcc b/gcc/config.gcc
index 8b380ac..8099ed7 100644
--- a/gcc/config.gcc
+++ b/gcc/config.gcc
@@ -3302,7 +3302,7 @@ case "${target}" in
                        | k8 | k8-sse3 | athlon64 | athlon64-sse3 | opteron \
                        | opteron-sse3 | athlon-fx | bdver2 | bdver1 | btver1 \
                        | amdfam10 | barcelona | nocona | core2 | corei7 \
-                       | corei7-avx | atom)
+                       | corei7-avx | core-avx-i | core-avx2 | atom)
                                # OK
                                ;;
                        *)