[ELF][RISCV] Don't set sizeRel

This exists to support __cap_relocs for preemptible symbols, but that
was always a bit broken and was replaced long ago even on CHERI-MIPS
with proper ELF relocations (though the option not to still exists).
CHERI-RISC-V never used this, and CheriBSD does not support it.

Author: jrtc27

lld/ELF/Arch/RISCV.cpp

@@ -112,7 +112,6 @@ RISCV::RISCV() {
   pltRel = R_RISCV_JUMP_SLOT;
   relativeRel = R_RISCV_RELATIVE;
   iRelativeRel = R_RISCV_IRELATIVE;
-  sizeRel = R_RISCV_CHERI_SIZE;
   cheriCapRel = R_RISCV_CHERI_CAPABILITY;
   // TODO: R_RISCV_CHERI_JUMP_SLOT in a separate .got.plt / .captable.plt
   cheriCapCallRel = R_RISCV_CHERI_CAPABILITY;