RFR: 8354254: Remove the linux ppc64 -minsert-sched-nops=regroup_exact compile flag

[Erik Joelsson]

On Thu, 10 Apr 2025 08:19:19 GMT, Matthias Baesken <mbaesken at openjdk.org> wrote:

> On linux ppc64 / gcc , we build with the compile flag -minsert-sched-nops=regroup_exact ; this is most likely outdated, maybe it was still useful for old Power6 machines.
> 
> See https://gcc.gnu.org/onlinedocs/gcc-11.1.0/gcc/RS_002f6000-and-PowerPC-Options.html
> -minsert-sched-nops=scheme : This option controls which NOP insertion scheme is used during the second scheduling pass. The argument scheme takes one of the following values:
> ‘regroup_exact’ : Insert NOPs to force costly dependent insns into separate groups. Insert exactly as many NOPs as needed to force an insn to a new group, according to the estimated processor grouping.

Marked as reviewed by erikj (Reviewer).

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PR Review: https://git.openjdk.org/jdk/pull/24564#pullrequestreview-2757576450