riscv: gcov: enable gcov for RISC-V
This patch enables GCOV code coverage measurement on RISC-V. Lightly tested on QEMU and Hifive Unleashed board, seems to work as expected. Signed-off-by: NZong Li <zong.li@sifive.com> Reviewed-by: NAnup Patel <anup@brainfault.org> Acked-by: NJonathan Corbet <corbet@lwn.net> Signed-off-by: NPaul Walmsley <paul.walmsley@sifive.com>
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