8183103: Post loop vectorization produces incorrect results
Summary: Disable AVX=3 and PostLoopMultiversioning by default and make them experimental in JDK 9.
Reviewed-by: kvn
8183401: compiler/jvmci/jdk.vm.ci.code.test/src/jdk/vm/ci/code/test/NativeCallTest.java fails with The VM does not support the minimum JVMCI API version required by Graal
Summary: fix version check in Graal
Reviewed-by: kvn, redestad