RISC-V: reduce mcount save space on RV32
For RV32 we can reduce the size of the ABI save+restore state by using SZREG so that register stores are packed rather than on an 8 byte boundary. Signed-off-by: Jamie Iles <jamie@jamieiles.com> Reviewed-by: Andrew Jones <ajones@ventanamicro.com> Link: https://lore.kernel.org/r/20221115200832.706370-3-jamie@jamieiles.comSigned-off-by: Palmer Dabbelt <palmer@rivosinc.com>
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