[11u] RFR (S) 8207779: Method::is_valid_method() compares 'this' with NULL

[Zhengyu Gu]

Looks good.

-Zhengyu

On 4/15/21 7:56 AM, Aleksey Shipilev wrote:
> Original bug:
>    https://bugs.openjdk.java.net/browse/JDK-8207779
>    https://hg.openjdk.java.net/jdk/jdk/rev/b5aac518b097
> 
> I was looking at backporting this to 8u as the pre-requisite for 
> JDK-8231949. 11u backported JDK-8231949 without this fix. But, I think 
> the fix is actually simple enough to backport and it dodges UB as a good 
> bonus. The patch does not apply to 11u cleanly, and requires adjustments 
> to fit the context differences. I grepped the source for is_valid_method 
> to catch all other places where this needs to be adjusted.
> 
> 11u webrev:
>    https://cr.openjdk.java.net/~shade/8207779/webrev.11u.01
> 
> Testing: Linux x86_64 fastdebug, {tier1, jdk_jfr}
>