hg: jdk/submit: 8227397: Add --with-extra-asflags configure option

[sgehwolf at redhat.com]

Changeset: 44d8fe024dfc
Author:    sgehwolf
Date:      2019-07-08 17:44 +0200
URL:       https://hg.openjdk.java.net/jdk/submit/rev/44d8fe024dfc

8227397: Add --with-extra-asflags configure option
Reviewed-by: duke

! make/autoconf/flags.m4
! make/autoconf/spec.gmk.in
! make/hotspot/lib/CompileJvm.gmk