RFR: 8257630: C2: ReplacedNodes doesn't handle non-CFG multi nodes

[Vladimir Ivanov]

On Fri, 4 Dec 2020 07:24:42 GMT, Tobias Hartmann <thartmann at openjdk.org> wrote:

>> When looking up an immediate CFG node, ReplacedNodes assumes that control input is always a CFG node. 
>> It's not always the case: for example, a projection on a non-CFG multi node (`SCMemProj` and `LoadStore` respectively).
>> 
>> Proposed fix is to skip projection nodes first before checking for CFG.
>> 
>> Testing:
>> - [x] hs-tier1-6 w/ -XX:+AlwaysIncrementalInlining
>
> Looks good.

Thanks for the reviews, Nils, Vladimir, and Tobias.

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PR: https://git.openjdk.java.net/jdk/pull/1580