RISC-V: Fix .cfi_offset directive when push/pop in zcmp
The incorrect cfi directive info breaks stack unwind in try/catch/cxa. Before patch: cm.push {ra, s0-s2}, -16 .cfi_offset 1, -12 .cfi_offset 8, -8 .cfi_offset 18, -4 After patch: cm.push {ra, s0-s2}, -16 .cfi_offset 1, -16 .cfi_offset 8, -12 .cfi_offset 9, -8 .cfi_offset 18, -4 gcc/ChangeLog: * config/riscv/riscv.cc: Set multi push regs bits. gcc/testsuite/ChangeLog: * gcc.target/riscv/zcmp_push_gpr.c: New test.
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