[Bug testsuite/102658] [12 regression] Many test case failures after r12-4240

[linkw at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=102658

--- Comment #4 from Kewen Lin <linkw at gcc dot gnu.org> ---
Created attachment 51576
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=51576&action=edit
rs6000-test-Adjust-test-cases-due-to-O2-vect

Tested successfully on P9LE, note that it relies on r12-4273.

Still checking force-parallel-8.c is one target specific failure or not.