RFR: JDK-8246484 Verify patch at start of COMPARE_BUILD=PATCH run

[Erik Joelsson]

Nice one, looks good!

/Erik

On 2020-06-03 11:09, Magnus Ihse Bursie wrote:
> I have supplied an incorrect patch to COMPARE_BUILD=PATCH one time too 
> many. This patch adds an early verification that the patch can be 
> applied, before starting the full comparison build.
>
> Bug: https://bugs.openjdk.java.net/browse/JDK-8246484
> WebRev: 
> http://cr.openjdk.java.net/~ihse/JDK-8246484-verify-PATCH/webrev.01
>
> /Magnus