[RISCV] Implement getIPRACSRegs hook (#125586) Fixes #124932. This patch implements the getIPRACSRegs hook for RISC-V, similar to its introduction for x86 in commit 14b567d. This hook is necessary for correct code generation when Interprocedural Register Allocation (IPRA) is enabled, ensuring that the return address register (ra / x1) is correctly saved and restored when needed. Unlike the x86 implementation, this patch only saves ra and does not yet include the frame pointer (fp). Further investigation is required to determine whether fp should also be preserved in all cases. The test case is representative of a miscompile observed in the GCC torture suite (20090113-3.c), though similar failures occur in SPEC’s xz benchmark.
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