[gcc r15-116] RISC-V: Add testcase for pr114734

https://gcc.gnu.org/g:ff4dc8b10a421cdb0c56f7f8c238609de4f9fbe2 commit r15-116-gff4dc8b10a421cdb0c56f7f8c238609de4f9fbe2 Author: Patrick O'Neill Date: Tue Apr 30 13:26:45 2024 -0700 RISC-V: Add testcase for pr114734 gcc/testsuite/ChangeLog: PR middle-end/114734

[gcc r14-9628] RISC-V: Require a extension for ztso testcases with atomic insns

https://gcc.gnu.org/g:65107faad79354a75844d8dba053be6509200504 commit r14-9628-g65107faad79354a75844d8dba053be6509200504 Author: Patrick O'Neill Date: Thu Mar 21 09:47:21 2024 -0700 RISC-V: Require a extension for ztso testcases with atomic insns Use dg_add_options riscv_a to add