RFR: 8258894: C2: Forbid GCM to move stores into loops [v2]

[Roberto Castañeda Lozano]

On Wed, 27 Jan 2021 07:54:00 GMT, Tobias Hartmann <thartmann at openjdk.org> wrote:

>> Roberto Castañeda Lozano has updated the pull request incrementally with one additional commit since the last revision:
>> 
>>   Use NOT_DEBUG_RETURN in PhaseCFG verification functions
>>   
>>   Move is_memory_writer() test into PhaseCFG::verify_memory_writer_placement(),
>>   mark the function as NOT_DEBUG_RETURN, and make it independent of the PRODUCT
>>   flag. Apply the same refactoring to PhaseCFG::verify(), for consistency.
>>   Simplify callers of both functions accordingly.
>
> Marked as reviewed by thartmann (Reviewer).

Thanks for reviewing, Tobias and Vladimir!

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PR: https://git.openjdk.java.net/jdk/pull/2140