RFR: JDK-8200083: Bump bootjdk requirement for JDK 11 to JDK 10

[Martin Buchholz]

Now that we are releasing jdks an order of magnitude faster than before, we
should reconsider the N-1 boot jdk policy.

The primary beneficiaries of this are compiler-dev, who might like to code
using the very features they are implementing.

But for users, being able to bootstrap with an ancient jdk is definitely
convenient.

A good compromise might be to be able to bootstrap with the most recent LTS
release (jdk 8) but it might already be too late for that.

On Wed, Mar 21, 2018 at 2:51 PM, Erik Joelsson <erik.joelsson at oracle.com>
wrote:

> Now that JDK 10 has been officially released we can update the boot jdk
> requirement for JDK 11. Cross posting this to jdk-dev to raise awareness of
> this rather disruptive change.
>
> This patch changes the requirement on boot jdk version in configure (and
> updates the configuration that controls what JDK to use as boot in Oracle's
> internal build system).
>
> Webrev: http://cr.openjdk.java.net/~erikj/8200083/webrev.01/
>
> Bug: https://bugs.openjdk.java.net/browse/JDK-8200083
>
> /Erik
>
>