RFR: 8336466: C2: Parser incorrectly/unnecessarily checks for clinits

[Vladimir Kozlov]

On Tue, 16 Jul 2024 10:12:35 GMT, Aleksey Shipilev <shade at openjdk.org> wrote:

> As shown in [JDK-8336103](https://bugs.openjdk.org/browse/JDK-8336103), C2 Parser code uses `is_initializer` in the code where we expect to only check for constructors. The fix nominally changes the behavior for C2. I do not believe this is something readily observable, but need to be more explicit.
> 
> Additional testing:
>  - [x]  Linux AArch64 server fastdebug, all (includes Fuzzer and CTW tests), passed as part of JDK-8336103 testing

Good.

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Marked as reviewed by kvn (Reviewer).

PR Review: https://git.openjdk.org/jdk/pull/20191#pullrequestreview-2180763251