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Sometimes "step1 -= scalable_frame" will cause adjust equal to zero. And it will generate additional redundant instruction "addi sp,sp,0". Add checking segement to skip that case. This testcase mix exist spill-1.c and adding new fun to check if there have redundant addi intructions. Idea provided by Jeff Law. gcc/ChangeLog: * config/riscv/riscv.cc (riscv_expand_epilogue): Do not emit useless add sp, sp, 0 instrutions. gcc/testsuite/ChangeLog: * gcc.target/riscv/rvv/base/spill-sp-adjust.c: New test.
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