RFR: 8239927: Product variable PrefetchFieldsAhead is unused and should be removed [v3]

[Stuart Monteith]

On Fri, 17 Dec 2021 12:03:37 GMT, Bhavana-Kilambi <duke at openjdk.java.net> wrote:

>> The product variable "PrefetchFieldsAhead" is defined in gc_globals.hpp and set in vm_version_x86.cpp. 
>> But as it's not used anywhere, removing this option from the JDK source.
>
> Bhavana-Kilambi has refreshed the contents of this pull request, and previous commits have been removed. The incremental views will show differences compared to the previous content of the PR. The pull request contains one new commit since the last revision:
> 
>   8239927: Product variable PrefetchFieldsAhead is unused and should be removed

I understand this might be a trivial fix, but reviews would be appreciated.

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PR: https://git.openjdk.java.net/jdk/pull/6783